Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2919be631c3e43…

MALICIOUS

PDF

148.6 KB Created: 2021-06-24 12:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7f04ef102b10808ad08fd6d4e811fd9e SHA-1: bde73f74060c2835cceae20e6385bb0cca4afa78 SHA-256: cd2919be631c3e43e848cb9348f0668eb4e5c9b3675974d59c6e37e6121b05e3
224 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/aaaac9733b43172369e9847723b6d466/bakogojozezijaxigek.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6fa6c9f6f---xudifepojovadumu.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/lejasozij.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7808a9d0f---dinineg.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/oh15lec7q8k32aqn0el2ktoe91/35653615928.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/kujutod.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/20506841286.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7747196d1e5793f5bc4affd0cd799d0c/sisidetafatug.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/40378489973.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160717f73ab58f---nutewe.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/71a92f04e4663f6049613fb66298c9c9/9125838711.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab995145cc8---73297975915.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607000a501449---vegubufudiwopanetalolepul.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc8d7896a---riwimis.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/dc58923116624add8ab8a26e4f6dfb2b/5527841469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=7th+std+tamil+konar+guide+free+downloadPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000224b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x224B0 19336 bytes
SHA-256: 673c182c259b2230f41932bb765e256ed0fc8539873051fc3068411103475dd3
font_00_sfnt_off0001ac16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC16 10000 bytes
SHA-256: 6632ce35a387c35085005e0a4e6ed0b43f813aff3079371e14bfa5335cd749b9
font_01_sfnt_off0001ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCB1 5460 bytes
SHA-256: fcf7927126b6a30e0f545e38987f1028be973819aafb1c8df5026639238c191c
font_02_sfnt_off0001df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF2B 6576 bytes
SHA-256: b12486dabeab348f1cf03fe2503987045c973e44be78c646abd5bfa8b4b734be
font_03_sfnt_off0001f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F313 15800 bytes
SHA-256: 95b49eb6343d90b617a16f79f8b388f4dbf5bc1032866c6ad7c7fb711559da03