Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cc4d3820c6cec2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-15 09:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85f0b2a3d7b84c6e4481fe9791f14b3e SHA-1: 9eabaf43a971dc0bb3d75376f752e45534ae14ef SHA-256: 93cc4d3820c6cec2287c3a358d0429c9044eca7f764efabeacae1ababbd4b5de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests an attempt to automate malicious actions or further obfuscate the redirection process. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://gencshoworganizasyon.com/upload/ckfinder/files/pawaxidibaranubixide.pdf In PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/pukabinaxegaxibigamu.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61352180e8391.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ebv5dtolf9qscirk2hlff92qbo/45361788109.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/xonawagum.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59815933911.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413bee354a2---95071623393.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/50611254072.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/46793697247.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/78571741413.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140baba0b159---pipebebitidivumedig.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/28774975324.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/fajilemet.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///lozepuvebalelirosexi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c16071b19045fc91c2cad20597101794/88052496886.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/segedufejimutu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/26354656162.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/foxokija.pdfIn PDF document text
    • http://cy2hand.com/userfiles/48006090357.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/pupixi.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/14102863967.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/sufevuwiz.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/79315954269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+read+json+file+from+rawPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 18436 bytes
SHA-256: 2344d6c5d1a4213dc500c0d29cae50e924aa79d51220a6c51b1297ab21f26c02
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 10616 bytes
SHA-256: 0504a6120d58f2c260d4f61bf961762c7f376fa6b08e887a056b12a33d820b19

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