Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7e1cbb8022b4c5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 10:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f84ae28cc983db42cc6844a6dde9ce6 SHA-1: efa7e0b02aa015caac4b0491155d2f2efabebcb9 SHA-256: ab7e1cbb8022b4c55fd267c063f5daebfca223623366d0fcee9b6253921befdb
156 Risk Score

Malware Insights

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

The sample 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 several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://banphimchuot.com/userfiles/file/duposulizusugos.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/12bc13b08583dc7f3d546e103c609945/letalotu.pdf
    • http://qazaqbanki.kz/data/content/files/25530503646.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/rakina.pdf
    • https://sharadsangam.org/UserFilesTwo/file/gifuwetefefezima.pdf
    • http://wxeina.com/userfiles/files/15036640877.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0cfipkc0cqt6sm4bpvfuuok7if/vawadoxejefeseduvazo.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f9cdc4fbd---pamop.pdf
    • http://taiwan-tsai.com/upload/files/26800040792.pdf
    • http://royalgoodviewresort.com/Uploads/file/wubipatafowuk.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aae0256df---varatidebogemafud.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/rasamapepubizajijitagama.pdf
    • http://crm333.com/documentos/file/xobujomegiruxugemuvetuj.pdf
    • https://keluargamimpi.com/contents//files/91759748695.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792a867357d---wosuzojotabema.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/94638349243.pdf
    • http://easyreturn.store/userfiles/file/3534610851.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/gonowupupelukizawupuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=citroen+c1+2014+manual
    • 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_off0000c95a.bin
dd9600420161ab4e19fc07f8ea4b3161fd953985e7553debe64129fb9aafd7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 10728 bytes
font_01_sfnt_off0000e21a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16792 bytes
font_02_sfnt_off0000fa2c.bin
ad93079bf3d4f490af99d76acd5992e8f7b329e3ea5a70e26cd1d5980b33613a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 18316 bytes

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