Malicious PDF — malware analysis report

Static analysis result for SHA-256 568cab7d9ceffdd4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 06:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a99220adc4a54d9882090ab90df379d8 SHA-1: fefc4230aefeb81bee3271402f3f88b07acbc98c SHA-256: 568cab7d9ceffdd4e0eb6a964fa54148ef7790a755d52cd2d9ea9cf4c0252eb3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/18b85ce8afd2e68a5f3188fea861f96a/26224300049.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/lopikonogixozixomobo.pdf
    • http://jadeite.ru/images/file/jewerukizopoludaxurow.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/98775614222.pdf
    • https://yar-net.ru/userfiles/file/25017957098.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/lqt2g7vpaef738eoncsmrl7p1j/1863673987.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/15309b153404898d0b27a960a59eb863/towusoligapijefof.pdf
    • http://pretaporter-pegah.com/userfiles/file/1697774753.pdf
    • http://hf1968.com/clients/48820/File/wusab.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f9d12592aca409eec96a29c3776fba32/fexut.pdf
    • http://elijasprojekts.lv/files/file/zexanimimenifibevi.pdf
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/jokivotod.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/d1ddippudar4l9n66jj59r6jm4/78235409656.pdf
    • https://airflow-skateboards.com/upload/file/xojajitedelamizo.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/17439070710.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5a35d5db50a37cf8f96ddb8c02f6fba0/34535579177.pdf
    • http://palenice.net/obrazky_clanky/file/vusogixubizededo.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/140td1c525vtkcg7mt559ofldt/rowikur.pdf
    • http://myflora888.com/ck_files/files/kewujunamakusudake.pdf
    • http://www.bandungmesin.com/file/25281214129.pdf
    • http://czechdidgeridoo.com/admin/upload/file/lijubusi.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/gosikimajoxozi.pdf
    • http://tucsokszekszard.hu/images/news/file/zutanexawigutujurofel.pdf
    • http://patroha.hu/file/senubomaguz.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091390e2a4d6---jonalopamefurexewezitur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+print+to+a+pdf+on+a+mac
    • 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_off0000df88.bin
d0cb8aef74a5fba00ffeb18a3ee55af93197f22e3b8327c0a95a192858915e8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 10512 bytes
font_01_sfnt_off0000f76c.bin
de83a3ad0ca5e72e7683c0dce78ab378ec630c32c0b165af03396a037a669e83
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 17700 bytes
font_02_sfnt_off0001246d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes