Malicious PDF — malware analysis report

Static analysis result for SHA-256 91547241d34ea499…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 20:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: dc036fd65f8906beb3941bfeb0f3095d SHA-1: b822725a9d65aec945c78c562d988597950b57ba SHA-256: 91547241d34ea49991ce3758def78de2cc788faee1b42e3d2c8407c3d3dbb9f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://local-minicab.com/survey/userfiles/files/68990530642.pdf In PDF document text
    • http://gocreate.termall.pl/upload/fck/file/roweri.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/73999749889.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d24b10d6b---27036515317.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/vemowofavur.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/cfa53a8c6ea18442f79b8b2dfd78b8b2/zavebagiwarolik.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096afd508405---60008133252.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/gebewadasukasofor.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dcdc58b81---waralopesavasat.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/46962147542.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6472f063---zusatodutet.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d669e48f5---74081979406.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/15692704517.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/podibiluwubu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607926154e26c---20781097564.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd058859f3---pozawumuw.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/63301271806.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/takulotugolore.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/8345582873.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/14148579393.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/lematoxera.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d400733bf09caa816013159320b18d5e/92543098095.pdfIn PDF document text
    • https://tckontrola.hr/files/mujetim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=inglis+front+load+washer+manualPDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 18400 bytes
SHA-256: 1570fcde0b227b571e707a4f6f3f06cf2145fa9cf8c6150a3dc23a69d183df78
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 10936 bytes
SHA-256: 09904f0319b3d0413a1e271cbefc1ec0dad1fcbfde23a705dc55c1f29a4ef211
font_02_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1