Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf3577d48075b42…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 23:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e70692e6bb6938a9b6534288baf1c514 SHA-1: f1a838df2bd44c363bc44f0097e2a2ae01fe5595 SHA-256: 9bf3577d48075b4235f79a94cbeb4df60715e8279924c26da44a0e6515f2ea5a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://karpatskiles.ru/store/file/babixazapewif.pdf In PDF document text
    • http://edu-soft.ru/site/htmlimages/file/pevonubetomide.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/21ebdddb2e51feb63ff329d0508173da/49928175147.pdfIn PDF document text
    • https://fratellifurloni.it/file/80847522841.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/56670538263.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/gepadilovufinaletiparasu.pdfIn PDF document text
    • http://grimastone.ru/files/57007558589.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/gativowemobonenutiv.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210905030202.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/92752644961.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/96540936599.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///77726842352.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/bufipefuludezajolurikujuv.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cee1c2fc15---giduxilukamawovatuwiki.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/36419764004.pdfIn PDF document text
    • http://crm333.com/documentos/file/55018629374.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jojufilukadolunu.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/90439111277.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/86646397166.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9k16e70fua2evp15t66rrdu367/gisifevilegoxafopano.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090223460473499.pdfIn PDF document text
    • https://ratodua.com/contents/files/49827372729.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/vebidoz.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/48226155514.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/92927522831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=share+mouse+and+keyboard+between+windows+and+androidPDF 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_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 11072 bytes
SHA-256: 1c92e10042c754f843a76583679cf84665b218796c1d9f681c41074c516b8f8c
font_01_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 16384 bytes
SHA-256: 8e697156c0536b09b12143f2c99932cecb22a4ffaf28116ee1c22878fb8fdf4d
font_02_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1