Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c64c013f511da9d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 09:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd420d225e5318c950925e581aee0858 SHA-1: d92c1161f76635ac8bdc39f7f00cefdc1373d16a SHA-256: 7c64c013f511da9dcda5a4e30bc31ec0cd2cadc755d5897dbfbbc4dd2b25f1e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=core+rehab+exercises+pdf PDF link annotation
    • http://phongthuydotho.vn/upload/files/ravutekikejojosoloku.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/56371309242.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/87627202246.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/24484845581.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4c8089e6---xuvali.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/newapapejol.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/77852348552.pdfIn PDF document text
    • http://esistore.be/userfiles/file/welufikotejov.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/cofi46pjglqc5fc5l66pj55bk1/wesibupufololawonosotoma.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/23ff0a595f7e92076645c5a86bd21e60/dofadileg.pdfIn PDF document text
    • http://geodez.com/pliki/file/77220025269.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/neparurositawiwovo.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/90888027915.pdfIn PDF document text
    • https://melz-feu.ru/upload/sofoxozubiwizivizaza.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a12368bcb1---nudatovomirane.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/rososuvisevi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e7278caca057500451c64acd532d077d/fegaxojawojuzel.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/57191117869.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/tagugalevixapawaluluganox.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/mabolavibutap.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/fgafjuh5kk0sub2vo693n447k7/fopup.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1daa45473e49784a3014903d65e9f9eb/bidekufe.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/95978236513.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/29455752926.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/it7ju6i3kvu1083s41iu2gcst1/zamagunuwoxisimugokizum.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095e02c2175e---vozolodizefidobibab.pdfIn PDF document text
    • 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_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10744 bytes
SHA-256: fba325d0cb5954ac3c02d4860aa1dafd7bc7e378f4430b90864fe49243cdf017
font_02_sfnt_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 18376 bytes
SHA-256: cf5c854c66afa58c59185156afaab81244053b20570f596b3fc7dca722ea41f7

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