Malicious PDF — malware analysis report

Static analysis result for SHA-256 245bd1e678251b08…

MALICIOUS

PDF

93.2 KB Created: 2021-06-29 02:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 094cc2bf985a5f38ce2f939eec175d68 SHA-1: 801aa0b3f903781598fce022486746375339cac0 SHA-256: 245bd1e678251b084b9508be352cfc6b0ff537e16a01d70801bae86f6614ab76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f371a30fd2---sulobuzezopazatewoneworo.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5137898a---daduzojuno.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/5327349299.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b31aa66a9f0---73036664323.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/14034127058.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nhls9u1qea674ie35egnbbjok0/luvokitiwifupifa.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d4e4f3839e5128d7df3299267b767267/titaravewolaze.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5aed6ad08d4bec8a9769cb9d2242df76/tagamit.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3usnhit1s31dqdglchuadn3eir/joduzudonuvazaxiwimoni.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zoxopozisirevuzewumul.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/33489139547.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf0de07d7---titezawivala.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b12a94f54---kigefixesemusotulixagim.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4da767060c---nimesabokewiro.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j6v5a6jsen3hjvrus3smjqv4i4/29933819005.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5d309aa0bbee30d5184c9e1ba3cdcdca/rurevizujatener.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8be9454d9bf1e99059dab3a9546b89a1/61748348602.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/24603461754.pdfIn PDF document text
    • https://luminex.pl/upload/file/9687346980.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf1f135c6---67066243630.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c44f04e10---84304903533.pdfIn PDF document text
    • https://csn-alliance.com/data/files/90765934576.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e5f71c2bd3659b8b60bd1f8d897c5cf4/11691529142.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6b088d2a---90579347213.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/pubagubakesugi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6bfcc8398d3d9d0a361d71400092dabd/42339251365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=employee+data+entry+form+excelPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 17372 bytes
SHA-256: 0b4d0f50a96ca047ac75612949cf329cd4a14afea423bd20bb15be5102048c17
font_01_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 10720 bytes
SHA-256: 2f6487fb8a8f6b1b451ab741a1beb3bfb46ce119497b7812b18c6aa94cf06d75
font_02_sfnt_off000134c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C2 17476 bytes
SHA-256: d21ffd57c5601334d03ffaf7e197edd9fce62d0c10e6523c5dd3f17cdde2e59c
font_03_sfnt_off00014d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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