Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da9c1180e2d9335…

MALICIOUS

PDF

89.3 KB Created: 2021-07-28 05:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44a729cf1bf73d4dafb4527947459985 SHA-1: cf03567b7f4cd5e08218408c2e4229f7db52ddc4 SHA-256: 9da9c1180e2d933586d7e89f4220ff2eb70d00fe408734414c81369110e4675e
196 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics, including an ML classifier and ClamAV, and is strongly indicative of an advance-fee scam. It contains numerous links to external PDF files hosted on compromised websites, likely serving as lures for the scam. The document body is heavily obfuscated and unreadable, but the heuristics confirm the intent is to trick the user into paying fees for a non-existent prize or package.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://brette-animation.com/userfiles/file/tusezitowafilukijariwejem.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/efa200e93de7beb6433acc45cf43a18b/68642191176.pdf
    • http://tdfinalists.ca/clients/43449/File/87025499292.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/n5f1n2a1blah8chvp1hb0c4ijj/32417538359.pdf
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/32933382696.pdf
    • http://stinpo.com/ckfinder/userfiles/files/wejijaxuva.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a508187854---xurukidivedupalaga.pdf
    • http://gesundimjob.at/images/content/files/83001845076.pdf
    • http://bobas24.pl/Upload/file/relowuji.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/nf0alt5m3itvmssef86do0dvr4/13228805338.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7690c1405---68104159316.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d357d412f---wuruke.pdf
    • https://aawyx.com/sites/default/imageuser/file/fiwozunokulep.pdf
    • http://deurenhanger.nl/userfiles/file/39779121713.pdf
    • http://abwingsmd.com/uploads/files/ridukokirobosiviv.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd1c26fa5c---jusotizadonipijakoroku.pdf
    • https://ckmandarin.com/uploads/27897759182.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/pazijurimuxidosone.pdf
    • http://morethancars.nl/uploads/edytor/file/82157769818.pdf
    • https://petek.biz/resimler/files/40000921843.pdf
    • https://bigpointpin.com/calisma2/files/uploads/51659099006.pdf
    • https://presstone.hu/userfiles/file/bezavak.pdf
    • http://nabisori.com/userfiles/file/suxum.pdf
    • https://magatek.com/documents/file/zutajufujijepewape.pdf
    • http://tnslib.net/userfiles/files/finiseriralidefu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+do+a+strategy+canvas
    • 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_off0000f856.bin
e1913bd3024c9d7052bb03cd1e493291b4b1dc4e0f3fc158e3ad91203021e561
pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10664 bytes
font_01_sfnt_off000110be.bin
052feadb4ca6f4ea00d45ffe57fe94af6183ee99bf84b1559247c2e1fac36e12
pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 17800 bytes
font_02_sfnt_off00013f6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6C 16792 bytes