Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72d2d903ccf37eb…

MALICIOUS

PDF

86.8 KB Created: 2021-08-17 00:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 476c9fd8425d4e9b8ea8bcc01f8f5bfa SHA-1: 383316ef75079df40efb42318c3dc723945b3e36 SHA-256: b72d2d903ccf37eb752f85bb59d715f58e5c670010245a3bef84d2fa53954309
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute further malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number, a common tactic in phishing and tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://taxicityplus.ru/userfiles/file/belegurokaxuwite.pdf In PDF document text
    • https://jgranit.pl/userfiles/file/wagodarosuduwoliwuvagu.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/26924895158.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edad92623cb---balipisaxuzidojaz.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1008b075f---vetoxujutekabutanasatora.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/be34a1f58fa42c58533a7e73ffa53056/85404783863.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c273998213---koxus.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/wuxox.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/24233310180.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/77864311718.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/68986884819.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210514102231_ai59c0.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xodaxipewutakabo.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/67111595572.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/kawetutofefudu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210806000300109.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/tobezogopotap.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/35458578716.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/95496658269.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/dutulegomiribopakowize.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13ba12bf3---53319109389.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vonibinuxalekurad.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cee3457e816c4d4deea85d1601632020/vegisebajatilepusajizu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/072291ead2ce64d77e21490b77ccba91/suzip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+care+for+suede+walking+bootsPDF 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_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 17008 bytes
SHA-256: c8767e46f71c29f62571b822752536ee4944201cf4759b156f88925c864d590a
font_01_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 11060 bytes
SHA-256: aff1114cb003b3ac99f697e4b97574bf91d65856ab4def699d3c56b8b95e37a6
font_02_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1