Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f6fe47d3a609f3…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 22:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8116ae7dfaa87f60f8af9324b434256b SHA-1: c69c525361e4fc190a2e0e7b841e1d9e584f3622 SHA-256: 39f6fe47d3a609f3e1e42659c1c36541e21c7bb1cdd50a4580289befd8d5f550
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of these links strongly implies an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=puppy+scooting+on+bum PDF link annotation
    • http://infinijewelry.com/userfiles/file/407064493.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/8432212041.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/24396550008.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9033e45tn0um686p7h5r97u1eu/mipalosorumemitule.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ee5c87e49e2f5795dc8637876c7ec3e0/16710740310.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14498d178---fifukiwapupos.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/81318734089.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/df0s0epplobinl955p6l1f8bv1/zuwozubuvedevalutago.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/j96c10k1hcsr6ogrvrp81545pe/929058995.pdfIn PDF document text
    • http://aweibel.com/Photo/file/sunujelutob.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/c14353a5803ce5991305d419652d2a55/xemimovisefarokoboreniza.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502073523500531.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b48550c17f3---saladopomitigupoxulifiw.pdfIn PDF document text
    • http://groupkaishan.com/d/files/sozebapoxowiwisosowute.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b11362a6ad2---63463662158.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bipokajoxezix.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2c03d98de1fa3bea3f8751e046306538/furovubafusubejugode.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/688896944a0dc4a0bc200bc5f052585a/binifew.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3d8b00d6---fewikejilivezozokasarexa.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0740c8c2f45d369f167a36cce80e8a14/11466261978.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/38463219930.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/i56s05v9n527du6nqvgcltiiuh/didum.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/wenusotisozezudijulaba.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3o0buuki1qq7bndvg1lf9pb8s5/93738105685.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7b1a5f27---nezivi.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 17504 bytes
SHA-256: c04bf6ea63f41cf7362e96e7de7fc9c2adbdaeda376d7c2c5b3655620f74a26c
font_02_sfnt_off000132f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F1 10632 bytes
SHA-256: 7139d6e7c6b411a39219ea24d63ee642afce0d70fc2f5af49ec6d6afeed2cdb8

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