Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdc950570becb81…

MALICIOUS

PDF

103.7 KB Created: 2021-07-29 17:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72406e7aa4d99df7e459c2dcf1547fb9 SHA-1: 20324e41e3f709e9b11f520f3051530020f48eca SHA-256: acdc950570becb81458a9b0fb149bf1ef980dfcec9ca58b8bcbf8ce8c8b00948
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a link farm designed to distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://er-trans.com/img/produkty/files/75508359227.pdf In PDF document text
    • https://securitydm.com/slicice/file/notitabajon.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086939252fd2---63898940464.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/24430003062.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1aruj17ds7orijk2bj4r8j30ba/tisikuf.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/21034667511.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/acccf5768664e2a25ba13c85b64f0f40/boxupe.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/37695679063.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5dcc55b7ffb31a39afea0fc823cb394e/94307908528.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/rozepotulofulowonepigavu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c605ebf960---wogolekevim.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6f2379b5d5ac80e522c5da46461af495/votusivedabaxav.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/mewejiw.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/padonopu.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/lasoresidutaxudojana.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qeig99ci8e8kd2o06e4our9p4v/jujesebidevubolukapex.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a192814ccae4db41ecbf11cef1d00711/12880871088.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df73026ee---tonasuboxeloxowavagida.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/30467579852.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1844549e60---wusajetazas.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/rojavofevetipanafojad.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6df085bda3---64828523695.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/vawesusilalonovaxesono.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/9152098771.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hssfatrmkq8jdrqi12a68tmsfp/91576869533.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/xeroromasogasamudebizerun.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/af2cd6db0b5bfe7aba61cc325e361022/diwozegonudumununofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rapport+de+stage+immobilier+exemplePDF 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_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 20080 bytes
SHA-256: b47d8c9c98f2780e35b689b527f0f961bff313964fbb1ba4272635dd6e660121
font_01_sfnt_off00015e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000176a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A0 10916 bytes
SHA-256: c58eedc81e42a90f9aad2baae1f8a0f5dd75c1377354f41648b1375b11031f91

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