Malicious PDF — malware analysis report

Static analysis result for SHA-256 70166d7cf07efc2e…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 16:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87db6a46e4040da5cfdd156b17754c60 SHA-1: f20d8531834002b3cb35a8a4e79c91407245b691 SHA-256: 70166d7cf07efc2e5a3ac0a2b48f3622206528c3121fe384d72530a234929a1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0b2a381e4d100461278a0fff7f5f537f/sefidizunixijarife.pdf
    • http://petra-dario.info/upload/datoteke/nudaredidemazisejugawip.pdf
    • https://299-45.com/CKEdit/upload/files/ranafezaperemuzawelo.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a778767ff42---rusozo.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a0baf09372ec7abd8ee5f33ca83c73da/gudodobe.pdf
    • http://alexhoffordphotography.com/temp/files/file/12303059318.pdf
    • https://ndmoyun.com/calisma2/files/uploads/sejakulafa.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xufadetovivu.pdf
    • http://garderoba.sk/images/_file/vawetuwevudezego.pdf
    • https://yarpaket.ru/userfiles/file/48063056983.pdf
    • https://samavetpharm.com/userfiles/files/tekijusale.pdf
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_172306_102.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/usmdvseb5i6ebohc4a7kf70iqv/kifutude.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/367d470b886197b69b51bb3cbad349d4/tawipezufajok.pdf
    • https://easy2ticket.com/upload/files/fuduzinexuzulosi.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8be4e52ad32f62a99cf7ab833849b7a6/34324879194.pdf
    • http://viewcs.com/partner/upload/dextfile/luxevexuditivaba.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c1def66d---polazumetikuwomulabinupon.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c02d782e339e05fcd8c2226c68c84e9c/famibipemafawig.pdf
    • https://faprosid.com/file/85066681964.pdf
    • https://bodegoncriollo.com/userfiles/file/bifutotule.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7b552bac6415c900f032701de11e5ae7/pegesitukiruk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=potion+fortify+smithing
    • 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_off0000edab.bin
2606d417c73464b3038c58ce21a95b560f0fd8323dbcc78257cce9207e73af99
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 17544 bytes
font_01_sfnt_off00011bbc.bin
d5f64e7f95e31044e2406483241c18dfbe11c4f822a1e26bbf3df5ef0ee264ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 10436 bytes
font_02_sfnt_off00013334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 16792 bytes