Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab51ffb8cbb90dc3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f57d59b54bb92e5e5e1783f035fe74d1 SHA-1: bdf0eb0b82fa68d371e51eb3f852f366f5f22e60 SHA-256: ab51ffb8cbb90dc38b1cc0e1cb1faf972e5cf1f3a0a11f5854191b7026cffa23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to URLs hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://jinanxintiandi.com/userfiles/files/xeramewobikixikuxev.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/81363047813.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/64297031882.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fbcfd214ba9209cf6f4a1143f8b384de/17884599219.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/wetolajujizokanikepe.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/60835874155.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c302e5517fa---zotopasitadepemevukazeme.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8069275d2---tasexakobivukerad.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/66874170958.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6a9abc6a---25940249345.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c31711a7c---73930589546.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/gogozut.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c1cd495f762c1be3ad6b4badf944bd34/9631592599.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/83c2e400885c95c2d2f9f461b3eaaf31/sikoleduzobav.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/23998619277.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/268605f96c1f5c3a6b777ea9b25b5ed6/nupexoveg.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/57927916248.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/36sd0urutmnb8evslq1p98a509/99310429985.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/bunosezuw.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106151926365086.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/95912496624.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/5797604151.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/xivasuviwolopulox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ariens+snowblower+platinum+24+owners+manualPDF 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_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 10916 bytes
SHA-256: 4835040cdf4339cd4520acda485c665208c3c7e0c2c0ae1ae1eacbaba14ef711
font_01_sfnt_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 17720 bytes
SHA-256: bd8d58f9dc508be595299554ae68f45c613ed7646421f0bffe613189ecd1f100
font_02_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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