Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d77d8ddb613f85…

MALICIOUS

PDF

89.3 KB Created: 2021-06-25 19:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1817d46909cb428cd36da114c99c045c SHA-1: 7bca941f0e81c2a0c9d3c2f8eb0a08cdca55a2ed SHA-256: 40d77d8ddb613f858b488fca41d04df703f4d92aa53fd1571735a1622ab67f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://tai-yang.tw/taiyang/upload/file/larur.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nlh4vlqfj20ctianf6namttb92/gipiliketewosuxu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd1f9705d---68941650892.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7f1d9b9a---dipujebunozositalemuliti.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7d3d595979e922bacf2fed9e3b7ed00d/53505544831.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/56db0ea080fb8d99ffa34a155a048513/4248795002.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hnmg2vs0kstvqu9vhc6ouqgedk/fijuvikedaromiduweboval.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b980c315b68---65431972732.pdf
    • https://mytekas.com/UserFiles/file/vididotivipibexaguvipen.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b431b0aa193---24494013529.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/faik04so8id2jvue76vt0p02th/sifusupizadiveroxurowisit.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bd46167f---kudirojaxoru.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ddf05639c1c2db512d4e7746ae7a8b02/xakapov.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/25727b22b1b906b27a7e66e3428a1c0a/58001691208.pdf
    • http://promocode.lu/userfiles/files/18482438205.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af941ca3d1b---sifodoveje.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0b23eac1---nabimanibelotodogube.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d04609efdfd81fbadd667ff7f3229ab6/66004466131.pdf
    • https://33mobility.net/uploads/files/34790574763.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4234515257f0bff252ad2a8d0ccd7111/kigonuvabadajo.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e1ee01d5db1dee4ff2f17965b505629/somuzexamu.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91f844f50---26659916467.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=old+english+for+dog
    • 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_off0000fcb3.bin
c1d1cfcda81c98455724020b9f6b1507842b4959a54608aa41f2e45e6f693c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10400 bytes
font_01_sfnt_off000113dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 16792 bytes
font_02_sfnt_off00012bef.bin
f39cc436aeaa5321cb31058f71ba933bd9db6cd813fe505f23c972b9d6dd3dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 17224 bytes

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