Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a01dbcf02890537…

MALICIOUS

PDF

102.5 KB Created: 2021-07-22 11:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e18bcc52e2ff5edc050fa188151b225 SHA-1: a766055a9dd15a16f7d4191675ba8918d97ca8cb SHA-256: 2a01dbcf02890537bb969a2802bf867b3f600676b4e377eade6081ae049f35f2
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. The presence of multiple links to potentially compromised sites suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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://www.evisiontiendaonline.com/ckfinder/userfiles/files/13788175615.pdf In PDF document text
    • http://radio6deenero.com/uploaded/files/fegof.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/4925425669.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/piwipe.pdfIn PDF document text
    • http://coffee33.ru/archive/file/fatuxatixiputudilu.pdfIn PDF document text
    • https://loctra.net/userfiles/file/14507065488.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/vixipipiber.pdfIn PDF document text
    • http://iltorg.ru/upload/file/susitolinene.pdfIn PDF document text
    • https://luminex.pl/upload/file/mafexur.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fje0pdjo5va3uq7f0jrpr73ks3/zovimatu.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b6e43dc0---jujimaw.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/70256514429.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609892b3c2001---40730483850.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/49028899424.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29e4da2e1---97634384734.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb93ae4a47---19206460287.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/laxinidokezilus.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/87885594065.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/83848864020.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/84484695472.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/11f27ee38bc11e0c3ef47d7ff7825a46/samoloni.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/meramasumatekati.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092efa03e291---81555497550.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a08c0117---24376165344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+three+questions+of+economicsPDF 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_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 10792 bytes
SHA-256: 77f0f305dd3686633c4225ff33bebd521f7793e555badd5216c5828e53e56c52
font_01_sfnt_off000144cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDF 17828 bytes
SHA-256: f181fb8877cfd74024c09196f993ebda45f615beadf2ab5a69fa594e5890f2de

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