Malicious PDF — malware analysis report

Static analysis result for SHA-256 62113765e9b5eb85…

MALICIOUS

PDF

95.9 KB Created: 2021-07-17 09:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9d89021f478775ddad7d3e8d6ffdb6ed SHA-1: ef2869ace32544da070fb32c84a97bf5491fb1e4 SHA-256: 62113765e9b5eb85fc48f203f449afe67375defa3bca34dc3ecdbe121489085f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or downloads. The `utm_term` parameter in one URL indicates a potential SEO poisoning or spamming tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ckak2pve3j9q5m5lbsvk3jgrl4/87919926137.pdf In PDF document text
    • http://preciz.com/uploads/wysiwyg/files/63664660770.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210702_094236.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e52af2b042---ninilikezuwulazolo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1947948c---83410791547.pdfIn PDF document text
    • http://beateromer.com/bilder/file/70292190103.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/pogamewidipojejululu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081227cacf33---jozavaxulime.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9661c79ec78b3a7d729e926370670cc1/xelawujixidudifedujidi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/27550437836.pdfIn PDF document text
    • http://laduses.nl/image/file/43373522756.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28007352522.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986f2eb2caa---66933813300.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e29d5dcc0---robanatosomepukizake.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fmilamr4su4ktfd2pp5nigje66/64883225830.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b01a3eafe---lesetikenavomafot.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac0bd1bf5---31125043509.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/vuvuka.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/56633042347.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pesusalugixulowe.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/40191808128.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2af98796af333af4f1fc25bb6d571911/sanazem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=diary+of+a+wimpy+kid+book+1+pdf+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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 17752 bytes
SHA-256: 31207c126ce9aecfc910faa7ef0cabb87f822f781551fe7a701b4158c46b5af2
font_02_sfnt_off000140f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F5 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off000156d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D6 10876 bytes
SHA-256: 956c22e7b1ff1de0fe25adec93331d249c230eb69205f085ad41e24e70d3d872

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