Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf130f83de3c72c2…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 15:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d91de148e8e30efbe8020c981561750 SHA-1: 685fe447cc3f2da42887302b7c67072251e6f6d7 SHA-256: bf130f83de3c72c24d4743f78a502a0d3ca1d15841d1639fac7e970b0ef8d57a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for phishing or malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://huntic.ru/uplcv?utm_term=corticospinal+tract+damage+symptoms
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0b6e1b47---guviw.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8cda38e93756bcd05a0612808d0fe802/72990659289.pdf
    • http://atut-biuro.com/uploaded/file/jarusoze.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4cf8d7fec8b656ae14eb27dccf5b7a79/78670871867.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2c2925a6976a25823ed7eaed6b9842dd/witozapanuverovibuwagas.pdf
    • http://local-minicab.com/survey/userfiles/files/tenobolidakokasubire.pdf
    • http://sns.hu/_user/file/turulafarodetivom.pdf
    • http://jrmhandling.nl/upload/file/51702821729.pdf
    • https://www.alapan.org/fckimages/file/jifijakilaruwifofanazuto.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fceed23d3ffae9601b800169b5b0b41e/11449977179.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/38012018785.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96bb20ba58c4f823951e250fa4b20dc9/25653660812.pdf
    • https://pearproperties.in/userfiles/file/sagumanikitisebuki.pdf
    • http://veterinariogiardinelli.it/userfiles/files/29499560218.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c9613c84---87643348476.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e801082e792f81bf4276a3691a283a55/56793644797.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d758491e---33824074499.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/87eus3f2iide7rbmbhpt038rmt/gazejolalopifaneza.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93bc0f6fb5242fae4bf4fcf10b789e15/5598627188.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8454262d1---52050720406.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/38051a7c7def9dab3ecc4e0213f817fb/siwemekelasoxebe.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/705ba472b73ba1a0708c109db8d96f15/37068482602.pdf
    • 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_off0000f081.bin
c38e1c7a6a631ea286fdb7ab664c47660183ac3bcd0d03f67886af70db23b9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16748 bytes
font_01_sfnt_off00011c6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 16792 bytes
font_02_sfnt_off00013483.bin
e557e72bda3b74b87af95b82b62407231e3f33c2efe7dafd0033e54c05f042b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 11004 bytes