Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa83c3d17e12c5d4…

MALICIOUS

PDF

78.2 KB Created: 2021-08-14 08:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c680c536d0a31eac7b4cbd2d4707c1c5 SHA-1: b382a3571582314e0ec6606dc6a214c32b92312a SHA-256: aa83c3d17e12c5d4ca93ecaedfe8bc22b8ca305edcd2383473258222896cdaf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=chemistry+bonding+packet+worksheet+%231+introduction+to+ionic+bonds+answer+key PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/85khtu425kht49i3jlkgmgrc8m/53483178150.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/63723599330.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075621006b0e---galot.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/95edb0d4d11f98aaade89f0118a5deb5/jakivepebipowimaxelub.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/poderavepibazivuferurosim.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/5388942170.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vuzovovetugatometinufop.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/11562678252.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/18c520e9009cb17daed5e5bae27a1a3d/dozanu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ef43051e---zovuxazigirovomit.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210723_7DAACD9DED3BABA4.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/95839879190.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/febe012c64566e544c627e0993d92bab/43637025248.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/cb378e6a7e46a196b05e645aeedce8de/motozoxowatixob.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/nowesewakabinabu.pdfIn PDF document text
    • https://nevisnews.com/userfiles/dipibukalixizalapamo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/28611ce287e1c63d143d5e25c8d82fd9/laderosujinujokajuzatape.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/46604204466.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/99660523596.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/64c436dd66519f57e82c505e768ce3ec/jabuvukoxetev.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee24d8ae2b---37465061012.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160da9a09bdf38---xasokukanira.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a915b8d0f39---36582030753.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_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 11376 bytes
SHA-256: 29f2568f7d79112ed990ba4934af7e3bf2ef6fb8ea470255946c5ea8b2fa7a69
font_01_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16832 bytes
SHA-256: 4f16657fa4da9c943811113f6e552dc431ff20926fbe3c4eaffa07d4d7964562

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