Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbdb9b7af1658c0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 23:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5564536aa07b536a80893b283bd56f3 SHA-1: aa33fbeb7bd3fb8825e7fbb97def4dee21733413 SHA-256: afbdb9b7af1658c0cde878e213ec399b21787405271e3ae4b7fdc2424a785703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/denojefovovosivojemoluj.pdf In PDF document text
    • http://rgn2u.com/userfiles/files/lupopakiw.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b66cfafa---zerer.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fcfde17f7445d44833429d99a113362b/luwodunebewakelu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/94892397823.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/71e008d34d43b1bc926da51b032e2f28/91610856128.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/jewojisinojoxebatowu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/aavd66vr13q8ac9ntqnlmbvqo4/35701310286.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/14450952211.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/20449556197.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf32baffa6---2680739222.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pejufegibuwasinilonadufes.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/45r9uqchpgtd79r2bbgg6a7ea1/81680383160.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/58193419008.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/gisopepitilodapipokitoni.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/berogeredane.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e1b2d77bd2d179bce48cd874f22cfda2/83234770105.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a39147b0a---mazugexepifosumuminenit.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/nonufawupidu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73202fe13---zakebigasalulok.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/5310366077.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4874b10c---fepovidefemunexibed.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/dogudawakumakovanowez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fractal+and+wavelet+image+compression+techniques+pdfPDF 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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16340 bytes
SHA-256: 2d0ac29d2ba9fd5b8de81b5da1e664b1bc277057ff44b1aa55b321d82498e9c1
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 11440 bytes
SHA-256: 23ae7476d4bfcd314ab17c1fc838a07f4a5f2ec865abfaa061bb0a0a4b38200b

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