Malicious PDF — malware analysis report

Static analysis result for SHA-256 03061c31ee19d585…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 23:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 648b326fb81669f2e4fdeaedc1776ad7 SHA-1: b92f15f71a0d3e0cd811299f32ac648581108dfe SHA-256: 03061c31ee19d58527f7c955746e0ee7657491509ed76a9337831479be924c13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is designed to drive traffic to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://esprimagroup.com/userfiles/file/47222746049.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608371cd0c556---velewo.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/86868017872.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/reboxepop.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db70cc07d3---pavujuxodepafu.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/70885435053.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3e01f1f5---fibixopofapize.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1b445c13789b89a58e0542e61a6b1a24/80268508043.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b328b7cde51---86138871998.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d1f057ad6e6d830c0ebd89886899e340/vanekazuderapol.pdfIn PDF document text
    • http://chieucoingason.vn/files/5066747409.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/44895794977.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/jatalefamageguwuzis.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/80172182025.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/rumefasaxujimekafimoga.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/99147263292.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/bbdd3443910001616f5dc0aa868f4734/37798043004.pdfIn PDF document text
    • http://raczcsalad.hu/files/63780595510.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6f0c77194e61558de8f8e10ca0b76e91/51802269027.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c960503899---masuvojod.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/supudasutaxolilujoga.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/30124370580.pdfIn PDF document text
    • http://ave-france.com/pics/files/8359727999.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160725126a3311---59218868801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=samsung+soundbar+ms650+user+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607282948f13f---tudoduxif.pdfIn PDF document text
    • 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_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 11140 bytes
SHA-256: c213c36813b32437e959a0c67d1c00742ca8a79805c25e21512d05bdcd114169
font_01_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 17576 bytes
SHA-256: 814e5160c15d6bcec35d3d1425a734279b4e266add06510cf6f5e163cc2ae9fe

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