Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8359a5e325238c…

MALICIOUS

PDF

103.8 KB Created: 2021-07-08 03:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 546c0a83e101424a355c45b00977c419 SHA-1: 08b8ed878d5ae1849b33ec0bac5618bf505b246d SHA-256: dd8359a5e325238c3857c4c30a5a3f36dfd6588cc4d0a7ca22c9ec98d0abd00e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing or malware sites. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://alexlunacoach.com/img/editor/file/mumigegefo.pdf
    • http://chinhsuasolieu.com/media/files/9232324682.pdf
    • http://beamstraffic.ae/amb/userfiles/file/zumewonebisinokeguvaxoz.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e30d250715bc44defc018df72fd18f34/45924858216.pdf
    • https://iva-vietnam.com/userfiles/file/82422063427.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071453bc05b2---63704273511.pdf
    • http://formpart.com/upload/ckfinder/files/xanekepasutaxob.pdf
    • https://go2germany.ru/files/file/89864634784.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25ce3dcd1---18819676028.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9da06ad33---rarope.pdf
    • http://nsk-nalogov.net/upload/files/nefub.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a679ba6fe1a---9890469814.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57e02d9ab---muginexa.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/96055158451.pdf
    • http://eurekaelearning.com/upload/news/file/1575962085.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094784aac4af---nafukixuzezalo.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/36skbb7d0ffqb6gjp0m3mrti20/76569044257.pdf
    • http://adimhukuk.com/resimler/files/93561451799.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba8e3fcfe---37442752329.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/40fa92a99d773d9491e152adc43219e1/71306943303.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/de6e0dd530bff66f9b01b04a88f3126c/77224217290.pdf
    • http://gandolfiarchitetti.com/userfiles/files/tixar.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cf62f15ccbd206bd20b1509300481402/28164551018.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ebf2abd3d---31980801707.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/895912712.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=8+ball+pool+hack+tool+download+for+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dad.bin
4b4bae31692009427933c4628eddc08d7331f32c7879372f7e52281a65dfbdea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 10848 bytes
font_01_sfnt_off00012674.bin
b28b639b500838a9e73df5be2d8869390805f9a8df6c760426d84dba47b07fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 26408 bytes
font_02_sfnt_off00015e54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E54 16792 bytes
font_03_sfnt_off00017665.bin
885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x17665 17112 bytes