Malicious PDF — malware analysis report

Static analysis result for SHA-256 664adf769c8f418d…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 17:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa46798dedf643d4f3405285276c3be1 SHA-1: 94b0eb5e6401d0c06c6780716272dbe2c2611caa SHA-256: 664adf769c8f418d33f0523579f3244859214497217a6977b521c6a737872516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=2020+audi+sq5+prestige+specs PDF link annotation
    • http://jjmcp.jp/userfiles/Image/file/52900213728.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ff6afc8312bd270d2d2b8e61e6609f79/juwidonezejozifewolibipa.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/kolapofunesefofixodipuma.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/tedofaposu.pdfIn PDF document text
    • https://digireg.dk/upload/pazikitenegegevomozo.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/36501325389.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gupagijefuxoju.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/gevikutit.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/54768209950.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/76419290704.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/didipavevew.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb3aa23be---bizekibumesijakumadatas.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/db347e9d7bd5e2b189a35b5fdce04fc8/wovagopotevu.pdfIn PDF document text
    • http://cecev.com/stockages/files/2380479298.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/18552603710.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e313cfea6---xiveti.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/segipege.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/fipugogejezitege.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/14922347268.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/eiqpcucmpnltpbnma780dfkpet/76455755031.pdfIn PDF document text
    • http://charivne.info/images/file/895634435.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/giworurifikibunowu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e01b6b2c18a9de96b83d7fea2a054bbd/3002186044.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c624b1a0f12a842940ffa83f41fcbe7a/webapadujurenidalefasidu.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/97208588665.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_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 10944 bytes
SHA-256: 176e243c01907337ffd2c0485d39a413e26d1b8c88ff75abf7b03f98f02fb781
font_01_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 17648 bytes
SHA-256: 5b3da847e58cdfcdc8964ed84b37d4d44f967e4c6fa95d8c7b88fc2c7f0422c5
font_02_sfnt_off00013a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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