Malicious PDF — malware analysis report

Static analysis result for SHA-256 58988a06635f5c4f…

MALICIOUS

PDF

89.5 KB Created: 2021-08-22 03:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc86887c11b471b98fbdfcb9d42fd644 SHA-1: 02667f0829618709bf344e709bc5d3ae90592720 SHA-256: 58988a06635f5c4f9fe0039379b5b81d58bd20f2307f5b69f09be3bbb08bab92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external links, some pointing to compromised CMS uploads and others acting as a link farm, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.vikingmaterials.com/img/64954772205.pdf
    • http://wojno-stal.pl/pliki/file/tadar.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/23caeccf5fb526ad8acd81a8060d6e25/8002302488.pdf
    • http://stylowa-pss.pl/userfiles/file/tusodipidiweladunaz.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f149c9ad428---74762667925.pdf
    • http://gardatrans.com/content/Files/pivanutozajitoji.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/6984a6a109b37f8e690ccc43bbf810e5/zunomul.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/23246727212.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1lugkufao4aq9ng4ouatnr7sg3/65691664201.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ec44c207a9a---36639736928.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f3d1a1dbb0211d4eafbdb6ec2e46915a/21234511112.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/60972886654.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be812fd80bf---46615654565.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7dpke8mcubritralpmfvi0ga16/28939176713.pdf
    • http://ikkosushi.com/uploads/files/zodorevazefe.pdf
    • http://connect-senior.ch/uploades/userfiles/file/66783691654.pdf
    • http://come2menorca.com/images/file/85670904980.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd890147c2f1df427f7828167492b7d4/fuminaxelim.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6cbb0d21---76641386436.pdf
    • http://otoozevran.com/resimler/files/zujovaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gbwhatsapp+delta+apk+download+latest+v1+1.1+in+2019+-+apkfolks
    • 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_off0000f8b8.bin
fa6834ec2102b7841111fcb2897402f282786c2c04760143dfb8ee693f0d326f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 16888 bytes
font_01_sfnt_off00012490.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16792 bytes
font_02_sfnt_off00013ca7.bin
b33ff6d046249c240d5281e8c4496db5e169c204dbaf62f84abf5164f31686d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA7 11480 bytes