Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6055883f3906d63…

MALICIOUS

PDF

89.7 KB Created: 2021-07-14 07:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d4be9ae10e36a566890f2fe40afdfd5 SHA-1: 1cc59fe7536be7af3f30d8cb2c29e97ddf3f3c84 SHA-256: b6055883f3906d6329f6f1dbd960e86a90e5c73043fef21232e8c071973004d1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bahattinburyan.com/userfiles/file/52832702181.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9260e75---14974386294.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/792eadaed1774524692527a5c0949961/89869132423.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/42c2ab0c48f3023a47eec8f2b153db06/76885117642.pdf
    • http://retroldn.com/userfiles/file/8444367766.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609412423ffe7---wizojatefogir.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d13d1236---dufavazububisoboduzijur.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9bfe53e7---pepidajod.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e08d6be3c---lewudofelipebutuwodisen.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609503d86d65e---zimuzabekafuba.pdf
    • http://studiovalentini.eu/userfiles/files/gonexujiwedukejulesoli.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qohb40jjv7ti4gdnpob75j6jn0/lulopufokabokaxitowiwija.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609304142aa0c---tofiloweniwojezex.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sgnid9c4a37td2e0591spuc7qs/rezazotodazeguvesuna.pdf
    • http://vidol.nl/userfiles/file/vexonobukoxu.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/712acaos4ua3npj3848c2ahkkt/22212508068.pdf
    • http://proxima-design.cz/files/file/jufuneroko.pdf
    • https://waroproject.com/file/togomapobuzapezogogezif.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609264f196c9a---16348408892.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5cb9e877---tosivafogisivefemijurutu.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071961cb2638---76490329792.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3295ec850a0173274b82d2956b503ed8/ribunatuxunas.pdf
    • https://itexpertdog.com/upload/files/90113355284.pdf
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/vajopekufuzunera.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rand+to+nis
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd18.bin
fffa051999495cdf0442f1a9fa216e41ac37c132250371266cc19a4a0c8bd73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10008 bytes
font_01_sfnt_off0000f368.bin
2236e496117f248c60468636f9fe04113c33e855a4ee452b819debcc515153f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 18620 bytes
font_02_sfnt_off000111f3.bin
d7e9989ee7d0a9dee11554e1add424952d0e6dc8fd40b0edce21c773068277f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 17932 bytes
font_03_sfnt_off00014014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14014 16792 bytes

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