Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66bd4a28d9637aa…

MALICIOUS

PDF

83.5 KB Created: 2021-07-03 08:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 438095005bfe5a06e6eedbea6dea57cf SHA-1: 818632ea0be8fb4343c8faf1f3415f6e1581b5ef SHA-256: c66bd4a28d9637aa74d4fe47a84222df408a930a93ab31e18f8270eb6c27aac6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://digemnd.com/UserFiles/file/tolujitoxu.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba96c18af---venaxorubelunawavapawug.pdf
    • http://uci.ir/userfiles/file/97778439142.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/zexataroferine.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608155a7dbe76---9042179366.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b042c8e68f7---72654323884.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4a8da956---movekezu.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094401009153---pawuva.pdf
    • http://195exim.com/datas/files/dizorib.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81d18daf9---momowagirofuwun.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hb9lc01v2hnq4ct9t2jejjfam0/bapalaz.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f4bd3f150d9479dc1add8dd2865bc23/39303224645.pdf
    • http://fashioneducation.ru/userfiles/file/wonazivipafelerepaxufeme.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q94ut8d9ui8vuniq55k1pn69vo/masapajagasabenev.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f0okaa5kcd4852jnmom2t6ugj/33336590177.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/77498355408.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c30f31a890dd74c48ed07337b577336a/savokenevefelep.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/6d631dab6d30744cab29bd610a6655b0/7389570162.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10d496519---dusajode.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094527579415---lowidezakine.pdf
    • http://kulturazebrak.cz/userfiles/remenexagowojo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+add+a+scanned+document+to+word
    • 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_off0000e569.bin
d590ca89cf786263aefb4a44cefb20379247536a7d4ac5c76a460cc436dc0532
pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 10568 bytes
font_01_sfnt_off0000fd8b.bin
219407e42d0723585c5c374e3569a2ef99f8040f8b6e81da2804778577bcd90b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16800 bytes
font_02_sfnt_off000128ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes