Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a626e4c60511559…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 20:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba710a2af2aee496c527336d37be3d29 SHA-1: cc2decd2ef5a0386ede2be896b0fe83f0838a078 SHA-256: 6a626e4c60511559cd39a9feed5cfc0ef2e4978708c1a05662076af09cf40b66
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=shayari+it+app PDF link annotation
    • http://bestpokeya.com/uploads/files/mobolegotarovuzofu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/47245d88815e9f1085805f3c0ac0b803/59048346929.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/12872084927.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/32431050303.pdfIn PDF document text
    • https://mlspoland.co/files/file/99563372498.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/53255408134.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd010af678---11644871949.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/fizim.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/tafiserejijezapifufoj.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/52914180018.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/pajilemimivenirewut.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109181430392307.pdfIn PDF document text
    • https://cowik.pl/upload/98587250360.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8afbf1d34---89786407275.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/pixop.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/wilodolavukuso.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/foseraxibawo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1dfb26210---lomixoribezodonute.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/zudezezuxeputuxilos.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/48609979144.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/36170344564.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/fonasidonemakatuduvogi.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/nedodawedokor.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/lumexijasujuropurawoz.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/85509169637.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_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 9968 bytes
SHA-256: b9da166bf402c1e25233071eabb1957a5d240b94711de41e6a8706723aa2a7a5
font_02_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 18204 bytes
SHA-256: 2eccbfef07ed1d32101ea36c1da9e1267877ec72366130d8bedbbf316608a845

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