Malicious PDF — malware analysis report

Static analysis result for SHA-256 85580a5da416fd67…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 17:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f1dfb7f55a152d7c268975be60056d5 SHA-1: a088916bea63573acc08296f66c40b8895c0244b SHA-256: 85580a5da416fd6732e9753f1f5a0a3ad9c90cdd38533af472e16301c317f49e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=free+robux+working+no+verification
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138543ae45fc---41702164787.pdf
    • http://beloezoloto.ru/userfiles/file/jixidixulusikorujunon.pdf
    • http://a-pro-peau.fr/userfiles/file/25278972222.pdf
    • http://mywayrtk.org/userfiles/file/fefeguzamalagitiwuzopoga.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/besez.pdf
    • https://ixiu-23.com/uploads/files/202109150558327690.pdf
    • https://felicityokolo.com/file/gotidafogimaxobevomatup.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614211303053b---xijebotozalemafukiz.pdf
    • https://es21sys.com/userfiles/file/10463185143.pdf
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/23338440911.pdf
    • https://best-label.com/upload/files/sozewevumituguretulum.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/75995568454.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/befibimi.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/wetedemozededijer.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/12367263199.pdf
    • http://conhantaoankhanh.com/webroot/img/files/zagozelajivimemujomew.pdf
    • http://nguyenthaotech.com/upload/files/37586470344.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/23497e8420499cced854d324d5863b64/15136552144.pdf
    • http://dansungsala.com/uploads/files/sosurisavesatowifef.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613962709734a---tewamiwutede.pdf
    • https://centaur.vri.cz/docs/files/dibixufopufesagegemub.pdf
    • http://dragoniresorts.com/userfiles/fijuragupemilu.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/nenibud.pdf
    • http://velapower.com/glwh/UploadFile/file/2021090522453273499.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32289e8fe---puxikagoxopefawezokizajit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin
fb7e6ed1402123d359e318e0265637a9e40101b15c1c514e6aef3138e317074f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 10860 bytes
font_01_sfnt_off0000ff52.bin
d7f21a0139cfab54c0e0621cd66cf4a664a339de905b9f201b41d626b8ce756a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 18152 bytes
font_02_sfnt_off00012ec9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC9 16792 bytes