Malicious PDF — malware analysis report

Static analysis result for SHA-256 61422f45cafa65b1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 13:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74d9e7a39fcab731beb41aec15d24577 SHA-1: e5a6456aad8f114c2278f9bd45a5a8cfc55b9e83 SHA-256: 61422f45cafa65b1a34a49bf68e4be63b63e2b0cc16f747541aa457ac13da372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://efficimm.fr/userfiles/files/42263817880.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a555c95754---1084572065.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec37c6a54---48220450917.pdfIn PDF document text
    • http://atek-ent.com/upload/file/15550349511.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bugigosalipixovagadeje.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/27689512724.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a2d14695f8dfb236104cc9ce28d4b457/93583419480.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/kunofawetenoz.pdfIn PDF document text
    • https://phm.vn/upload/files/89609403414.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/xugupigupugawofag.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/44399342938.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/wonepamamebofadi.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/dsqsb0lom5bc6akd72kedqv98d/xejojuwafaxisu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b180bc0e73b058b3174ebe6c2de82398/3993349562.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/kebavusanivitasasoduw.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad10dc34e8---29608457739.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deee66dd98d---58834644334.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/nonopipopedog.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662927d228---juvujogopopufotevenerax.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/wosagojujovomufamo.pdfIn PDF document text
    • http://nensi.si/upload/file/vurelum.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-02-02-46-50-vADKBTe9.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/sofatumimanomevitozo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c97b4b4a7f5dc03c32f45030a2bb3db5/22047290502.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/podokog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=silent+seduction+system+pdfPDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 17960 bytes
SHA-256: 1120c23fca3b1d1e24ac202a79840dfc8b424b88fb83a9233e8f0e1c53125f49
font_01_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 10808 bytes
SHA-256: 2485a47036b89586e08bc7cd51d277a00adb3d7dbd9b569d9fde61067662fa07

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