Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfe1b76ace81bc2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 14:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c70888ef063b0ddaeda2ec1aaed78427 SHA-1: 7dce6758a11e2c1513a04c19d739ed0d7c0cbbfe SHA-256: cbfe1b76ace81bc24b95d819a027ac72cd3cdacaec52ef1504ddca662d75b9a1
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URI findings and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=engineering+mechanics+dynamics+4th+edition+bedford+fowler+pdf PDF link annotation
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8842deff19a0fe0732b8dd0c307529dc/72438984974.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079529a2bbfc---22442936527.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d1u1o214q3lgrn9t04gf20le53/ranuxixonilifowubab.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mcnqr2r5rnu7ragd0hi8ouc830/vugogix.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/sasuruki.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/38866980349.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dd92923c---54325954052.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///73077461069.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1021881e33adb197f37c2096a289c3e8/fiposobibidaxa.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/borupizalesatekebedo.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/wuzatemotepurexagelafakof.pdfIn PDF document text
    • http://iviltra.lt/images/files/59553515652.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/49319196531.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609835b8b0e16---82310333949.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a991a544---mutupukuzezosi.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/tekofozep.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/83546933848.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/12756766353.pdfIn PDF document text
    • https://brakos.it/file/45100161361.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/aeee8eec6b3000e87844b3f635f3b831/denuj.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c0a7e1014889d11c71ad0c710cf357c5/82651679113.pdfIn 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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 18428 bytes
SHA-256: 2fb7c84b85bb72284a82f5a164ff7ef91b19ef9aa6b9a1c3d28bc5e19083bc15
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 11468 bytes
SHA-256: 86ce027e604674d0593cc82e9ff95a910669b3cac09e8893f87f59494ce4fd50

Open this report in the interactive analyzer, or submit your own file for analysis.