Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31f3b64d2ad576c…

MALICIOUS

PDF

114.7 KB Created: 2021-06-28 00:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28b6e207a7aaed2e992c1b8523411993 SHA-1: 9e9e9b56cc6ab6b7771d721ef6db6a13f2cb21ba SHA-256: c31f3b64d2ad576c64d54b439c1960cb699b9eabaefc8168b89a831f88334240
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's purpose is to instruct users to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf610762f6---45482357475.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/sefasesovaniponafovu.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/450355531e13a719dcf2c69f057da84f/redovisujimajep.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0b27fe2a---makapevilanojin.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5d7b22db---mawubi.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dd47f3ed---jedifidafupiwenupipojevad.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/j2pmcmjplm6gn40oj85vtueln1/fawafidixetigidelefet.pdf
    • https://loctra.net/userfiles/file/dobowizoropivi.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/81798d696e0c2ac2c41cd39a524b5b57/farovivubiwatapivewekare.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tlmg2ltk7hp86rgopcl8ugd4h4/kadepab.pdf
    • http://provia-events.de/pics/fotos/1/file/kirejagif.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bqsklovvprsp3shjudef7qae45/zegosotogelufupog.pdf
    • http://karinameal.ru/imgdish/files/39631814343.pdf
    • http://halaljones.com/uploads/files/18542199524.pdf
    • http://darec.sk/files/files/42502668997.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d095747d82b3c46d4d7092b7167f76f3/pidijin.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/25531190552.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607451fd82cc1---madupidagopomalamofo.pdf
    • http://paroissedementon.fr/upload/files/59854506750.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26ddb2fa92---38264940484.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073aa6c08fa9---zakikona.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fa364f564804f00b9be3ae630ecaea3b/kosagezevitugokomakeguda.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/01uh41ij9v4v8hq4l6sd0mc4qc/5972680240.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/42cdee103295c660c3a33cc6d1ea820a/wunavipamukolamixum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=operations+research+an+introduction+10th+edition+solutions
    • 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
stream_002_off0001396a.bin
dd74f70c39d24fe3271f8a16c5917cf616d628306a313a9d4e328026cbe5613c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1396A 20388 bytes
font_01_sfnt_off00015bac.bin
40d8b3b4ba5287aa937dae022765f479bb4fbff3c7b8f085f4bc8b200b924505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAC 17448 bytes
font_02_sfnt_off00018913.bin
8c52f931e33d1b26dd1ebf5ac3c70a4cdcd95c752aa0b3a8ef4e48cfa7264be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18913 10908 bytes
font_03_sfnt_off0001a244.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A244 16792 bytes

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