Malicious PDF — malware analysis report

Static analysis result for SHA-256 9311b15e2bcaa9ba…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 10:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f9171148da19c2576fcd355170eb7ee SHA-1: 826e1352d2be5feaae8a456b1e41eae38bc91321 SHA-256: 9311b15e2bcaa9ba8d3e091b3df7131b4857c5931dfd28fae4a4378e3e1fcf02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160757489b7c5b---volojobarokebup.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b7c8aa39---96081332266.pdf
    • http://akkoryazilim.com/userfiles/file/80637255888.pdf
    • http://jshtextile.com/UserFiles/file///gevatuzuseminemoxukuviwir.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3vd91g7kkmeacqga4n3hs4gi32/95383560619.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55d05c3be---juxovojidatosa.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b3f24de32a5370c78de4e9f75232225a/givalewodufajozadadinoduj.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/vatumube.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076272482808---lijowe.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3ba21245ba6c2189601f641d5336ab10/42962518126.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed24f91e40d5faacf7165c2396fb5ae9/fanipelewi.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fa206791a---25002294043.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160af94ef387fc---davosefolupuma.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b19a4d9a---69245376711.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/077880e336c6ea942b9e352ac1c6db15/remuwevadufoninugutuditim.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b02e92b12---viradof.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/h9u7ncp1hi0g8kmhkoi9jee33h/midevujazekijererabozun.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/61198856576.pdf
    • http://goldnumber.info/userfiles/file/83826334517.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8479daf4---vakopidatomidomasedufejez.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/zalamezujivetatetiv.pdf
    • http://brnc85.com/clients/878796/File/5143192967.pdf
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/4937009023.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f36dd8484---laguzirotosuzuxanamuga.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc59c94f09---vitiluwolifi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dwg+to+jpg+high+resolution
    • 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_off0000f01b.bin
c4e18383eabd8c21cb7188ce2f05e2898d9a502e9f46d71654fc1bbd30e8bd17
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 10684 bytes
font_01_sfnt_off00010899.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16792 bytes
font_02_sfnt_off000120ab.bin
47c025d2c7c6fb4c09afc75131d26c91f8770836318d3195c24163631c2e0180
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 18140 bytes