Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef4bf7fab27bde1…

MALICIOUS

PDF

93.5 KB Created: 2021-06-27 00:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b41878b2b555b5c2f24eaf9aad0b2f1a SHA-1: b9e174dc48fe825bef2882355f42e1bc48f79b1f SHA-256: 8ef4bf7fab27bde1585128f4835c1abd9a50d15f29816001f87f31a1a1264750
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the presence of numerous links and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://archerelectricsupply.com/userfiles/file/tuxiterejoferu.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/funoretipapolawulazavipe.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hg3u1cn45f9u848je901nfqetr/21580456770.pdf
    • http://centroolosprato.it/userfiles/files/42791814721.pdf
    • http://copy2d.com/ftp/image/file/23470758152.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99940461615.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cb7a2a35---bedapajinar.pdf
    • http://www.bash.cl/media/file/meruragazudoze.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a3ebf6945875603868cd0de62cfce7fa/57826677936.pdf
    • http://bobmeetin.com/media/galleries/files/fudavus.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/97616136330.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097f56eaf035---joniminuw.pdf
    • http://airbaankhubon.com/userfiles/file/fonajadeja.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88eb2bb7f---piromodaxil.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d10c6d9fc69d21be9bd83c131ae756ab/norosilagoli.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vs5s79i0d4prhp34ugs1lqb3io/92499654198.pdf
    • http://2sisaccount.com/userfiles/files/62143702581.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/280d43fe92c5a1392d9013847e5383df/50517353038.pdf
    • http://voxel-avocats.fr/uploads/file/99686557582.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8da82ec5---kezones.pdf
    • http://falerisztika.hu/tmp/99754493482.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mgtdb2uchl1jcn0884ts1d2g13/vezegujavolunaputuzirale.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c9eedada9c1678f3599e512ed6af2e60/polirijezigojuluberif.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dd28d834dfdabe0bdfb6df9f4ce486aa/1127368649.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/82769767172.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/954b34036c794b2bfe2e707ac7760cf5/zelaxovuwatamajumotog.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a866f6a91fe---budakevodugim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+you+know+if+nose+piercing+is+healed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 16792 bytes
font_01_sfnt_off00012229.bin
91079b48914b30b8ef1be443eebb774763a23a1c38372d867945cc7e45ab94a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 17004 bytes
font_02_sfnt_off00014e51.bin
0110b4b94cb9eb915523ce7da78d04ff7d46598d23f656ca9d4b8b073a758504
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E51 11184 bytes