Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e11becf6a620939…

MALICIOUS

PDF

81.4 KB Created: 2021-08-18 22:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f8c8f22244ec36444ed732bddc2e0287 SHA-1: 903c2e33c772164ae490aade6754794ff068a4e7 SHA-256: 4e11becf6a620939eb998133a1a9fcd6b4e9f93d44ad8e8cdf99ee790cbd1587
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 phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection scheme to distribute malicious content. The PDF structure and embedded URLs point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://drafthe.ru/uplcv?utm_term=site+reliability+engineering+o%27reilly+pdf PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/n6p0i2trrfqk6ksie5b1jdeq97/59001477737.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/vaxapofonosegifan.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161027bd5b1ee3---tutusivutilikanawowufaxa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4681412cab---bovoguradezofos.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609466e63e4c4---6368245345.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbddbd13bf---79626134734.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/6382880797.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/95890738421.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0dd7eba---46614417067.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1seh78949slm2hioiguutg8m0e/1598526090.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/skdtfuccrjvrj8jh9egm1ehuh1/15645486472.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/28179863987.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/lisosufewu.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607961f112d53---19907540478.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zexifuwadok.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105adb496180---8365689161.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/04/file/20210704_175912_158.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/gawasuxuzu.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062301222873499.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/69801851700.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/jodak.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961d270ba1c---7018237575.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ncd2adr4ctbqlutuf2qa7j5dqa/63756877672.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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 17736 bytes
SHA-256: edee60e94c54fc94818157452611be0a020764d37c9d5437179f8fa827a9857e
font_01_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 10868 bytes
SHA-256: 730bd29f3e5f06ad1ad9ba9373f5df16baa6c5f9fadfea0794058a0f464489f0
font_02_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1