Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3ab299f37b7712…

MALICIOUS

PDF

92.1 KB Created: 2021-07-30 12:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 513b2c871874815e60d1f90040dd2ab4 SHA-1: fa2bd898c70ff40eb6e9f608dbb264969f717208 SHA-256: ef3ab299f37b7712bdbd48b8db5a57d62751d94341a79c5e3c929d8385ad2411
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content, likely for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d44fed8c4ab920ed1fb89b6e1d080ab2/jijefazerutor.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf20a64b9---sibuvulivanaluwibit.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d9launcliedtotsfde5dlrfn32/tolisigi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc125851f9e---89928111425.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/39178528063.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/bijelabexeladolinabepexaz.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/zabamojijedexukinelanebe.pdfIn PDF document text
    • http://mav-auto.ru/images/file/likutobuwixunuxegilawe.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/48199920203.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4679554360ceba77cb6637c9fea834fd/50874440704.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf5d79e66---55346402541.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/puselikovofi.pdfIn PDF document text
    • http://msiutilities.biz/documents/janexepogi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/orslu4jegf7vn252deai57ef22/xotutevubojis.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd48407097---73045926488.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/76366575977.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815dfa5ea56---19059772734.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/47835788983.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083140309da0---61408176537.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/50e6aacc73c5cb30b10119a0594572f6/74091642030.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160899129bbfaf---babuxiladubezefalogisek.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/4jdg043mrhb625op9f1l5i9hmc/9832606733.pdfIn PDF document text
    • http://patroha.hu/file/garesuzozirosimazaxajuwez.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zinegadafugadotupi.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/90640126962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=el+llano+en+llamas+summaryPDF 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_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D64 10276 bytes
SHA-256: 821190347f7e8d5b2cfeee8c7fca0452b5383c94cc8ba1ac0b4097b9a3628ab0
font_02_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 18764 bytes
SHA-256: 926134ad473bb2af41cfaeed2c1e1f48deb1db3704eb363ea8548c992a9c3249