Malicious PDF — malware analysis report

Static analysis result for SHA-256 921162cae20997aa…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 06:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00f086d015515602902c06402dd717ba SHA-1: 8889c0ee4d7b243401d6c61884011b26f15b9c43 SHA-256: 921162cae20997aae44c96b9886b77da91f5e16047d29ca78e08da5ecf10a223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://avanti.pl/userfiles/file/28261192924.pdf In PDF document text
    • http://geose.ru/userfiles/file/libajoroguxa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a1108aeed7e66ebf123238c602fd2199/xakejuguwozomeb.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/60743930308.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qnk263tri4vp74cne2e4jj5di3/muvuk.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91e8f6e88e---34583033162.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac3d3a5c5---94107209596.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0554b4f8---selilakijiwoni.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/49475f92e1fe00ce9da7684ebb11e247/pofepido.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/sc0mo937lrpd43l2vh4tq59641/pakev.pdfIn PDF document text
    • http://vejwun.cz/images/darin.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/97be0bf65cec1997ef09ae0f0b45b880/16556506650.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/valusosovaxefezerubujipa.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c4734c410346a906dab0572a5a642491/14927094894.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/49705852643.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kolesek.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/rilebuvefexerigegogaki.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/70574418065.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/xopafulis.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2e1eaf62---nivobuj.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074766ca44c2---58282575857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=des+belles+paroles+d%27amour+pdfPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/53137533226.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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 21728 bytes
SHA-256: 7eec22fb8462955e5a0432e401bc06353a1ad2eceb59d6e7b9373b4c7cb4d6c3
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 10640 bytes
SHA-256: b95ad957cdcdea7bf84115006810101e3e31302392f792b66015593a9ce134a2

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