Malicious PDF — malware analysis report

Static analysis result for SHA-256 645b32d142e66296…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 02:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a42bcd2029d5b8106266793ddad883bd SHA-1: 760afba79742fe38d4469d40d5e7897adb793096 SHA-256: 645b32d142e66296b3c77c75c2040d62da34f6281d1d6f7c10f48b890bf917f9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=permanent+magnet+synchronous+motor+drives+pdf PDF link annotation
    • http://studiophotosfashion.it/userfiles/files/novuvuwopetowilowodu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d5d130339352d927eb6caca72697299e/lawafuzuselizez.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8tcve9ue925bbj8nqnsucq5u14/75146980705.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/84087430448.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed61733fd---58458786054.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/88345541424.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/47946332497.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/lasemozibowu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608447da4d7ea---37504949970.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/40023380693.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102c189cd99a---kubugabuk.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41025846d---birakudu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d078570e9e2---kikekujajadepusitiza.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/71011488900.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/13972764548.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/resosafusotasetoma.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1eeaba8e1---51448695477.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c5888da16---sagiwanuvubepawuju.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/55281a498c158f18a346d4700eacedeb/subegiwivexir.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/2225310389.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b739722cec---kiropu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021071614291255.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/79595363542.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/96950319988.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/vilamofilanutabijalavexag.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/044479a8080fdf701b564917921772a6/wuzizod.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_off0000b74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 15072 bytes
SHA-256: 7f0daaf3766f3e199291cc78613d2f64542f430bef1cb75ab02d57e0d21517ea
font_01_sfnt_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 11300 bytes
SHA-256: 5bdeb0b06bf4af5a2e43190f2a98a989d8e8f0a75cb66a1b2a27fd82954779e8
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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