Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb50e35329235a2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 19:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb1fff135f830c6c3ab9e20e2da9cee7 SHA-1: 1809c3ff04e0fb9acb9c7332e674e5c5bc69cc9f SHA-256: adb50e35329235a281e135b78c4f6ed49c4ea941f522ef8b0c14abc243f68691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm on compromised or disposable hosting, with numerous URLs pointing to PDF files. The document body is unreadable, but the presence of multiple external URIs and link farm indicators suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4b31efc291bd5f95e4fdba34f92e22f5/33868510810.pdf In PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8a0173644ddf1f8ccf25870f3c0f3f51/tuvuxunopejelibemoxokig.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ae21d3800303831726e586fd1c5cbdf4/kazaxofinabozazet.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/44267289164.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/43155287187.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a956679---59651726929.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/22a93a608ac7e27c7a74a0570c8b2c6f/jetijexuperegoripa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b4480f09a---xuxosikiginajul.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/tigomewani.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c2ea703d---24611304591.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/25741906489.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/81555641867.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609871cdc66f2---jarukawijos.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/56569374558.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4499dd4c177afd73981c96314bc29d9e/3824812803.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbe91ed13---biwigovefamov.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/81529082168.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b656ee2b762---24230915972.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/sodajezetopabizunumomonib.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d61ebe9c0208682e25ccd085d25a2df1/xurorotabelokaji.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/eb6q58qga8milr4ng6ol5lcp57/vexijakikomabusikelobor.pdfIn PDF document text
    • https://wrd13.com/force/file/8405626030.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093227b61e09---47286899909.pdfIn PDF document text
    • http://lactopad.com/uploads/files/82758371814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=process+analysis+paragraph+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 10916 bytes
SHA-256: 1cc0c2007b9ec89162197655fd00f763efcd75e0336bb146c82f08dd9eaf72c7
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11445 16200 bytes
SHA-256: 858401fb883039f01cc1444dd0a6a73b0e1e84da450e0e0b8da0913edd4963bf