Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b44f0b0aa569b73…

MALICIOUS

PDF

91.5 KB Created: 2021-07-17 06:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2eb3ef456ec0ab0360c62a95b4126e2f SHA-1: a3980d6cb49592a23b4e0c77fec0c5e4683c2268 SHA-256: 2b44f0b0aa569b734a2b5d4c01832322a4c806baca168a3db3a3b211f126f384
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing content or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sosnovgeo.ru/userfiles/file/zenuzowotinezofe.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0efd2150---tixipaxaz.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/3554058973.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/genifisebigawirum.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qv4fi6026auv8m09624jv7lou2/40187107299.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/rikejibixewuz.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/78022478426.pdfIn PDF document text
    • http://zuche0551.com/upload/file/xazugunavafix.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/a7lav1csigtgmnkc1ao6l0rb4m/95082356385.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/rijezu.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/4829263692.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d9139ff0e9eaf0af93aecb1f0130e652/bivabipavi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873296eeb9f---18880741033.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608508250b695---gimesevujeluko.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/13220089781.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7444beb141---81663376153.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/21ed39460ce41c7854b383f6434cae52/ketisujavuvo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13aa4ab9a237edbbc8646cafaa10a754/gojalerunewe.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ub9779tnd88r985an95tamqobf/xelanofifem.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/pukigafop.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/kosubalubizoluf.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/46047090230.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/v17v80he3jomn32i1lmp9kgv0e/57085790468.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/retugabo.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/savonaxotagurojekowus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+rate+of+reactionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10376 bytes
SHA-256: 7303fa2483c8832f66bb4a487607270fc76b6304b90fa08bf725c9cc0192391e
font_01_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 18156 bytes
SHA-256: 0b44bffc900a411b822fa1f1419d4d75c3c5087a63ce195338e865ea45f0c14e
font_02_sfnt_off000148d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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