Malicious PDF — malware analysis report

Static analysis result for SHA-256 4845473f8d6bdd58…

MALICIOUS

PDF

89.9 KB Created: 2021-08-07 23:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ad90a1ad9dd0eaaf9f2e255f9abc818d SHA-1: 65475d33d18bcac2cfe844a11946dafac975a9c0 SHA-256: 4845473f8d6bdd581d562b6b141e9c5de4bc10be39f35212e66d38d140155d62
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9982

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://regionalhealthprogramsww.com/images/file/1684225713.pdf In PDF document text
    • http://xsjprinter.com/d/files/gidonutezu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kowura.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726677bdbd4---67168745567.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d4f6fc73b20d2305569b7051f4717d90/sakajos.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/relexupebebodumefil.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceaf6c953e---61510767203.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a733207b---towuparu.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/14252459874.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ec439a68---ruremenejig.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/8859889082c305ad6b46149a1b8828ab/95007429013.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/5135048768.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/60889996103.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/zobezovidelo.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gjei6e41sgr22dmg31rgcl0he3/rawotazukimulimavof.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/86rb8ilpldo7g6nfolivfcefrh/39954769901.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44a27a2bf---wedigemobuwomamu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/kizivujukupezavabiseg.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wetekubaxedixasupeb.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021761344182094.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/85884837231.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/33262640912.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/62339177808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=libro+tribolog%C3%ADa+y+lubricaci%C3%B3n+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 19284 bytes
SHA-256: b616f32ee496a6b3a27d172b89910fb82cb319c4a39b6f6e6a3eafe88f82b79b
font_01_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 11008 bytes
SHA-256: 9a7627f114d5085e8b54efd8af5d9b423ac9d119965bef5addc6da3379245f55

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