Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdf50d66731cac0…

MALICIOUS

PDF

100.8 KB Created: 2021-06-25 20:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd74eb93613db6a51351ebc0136eac00 SHA-1: f9df81891bcd757e4a0f363b0ce4dff443882e8a SHA-256: dcdf50d66731cac06e12b21261b585ca662cce0ab996b8d2b6c8fff961bd4932
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS platforms. The embedded URLs suggest an attempt to lure users to these sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jcdj10vi64d03027u4f89s2i21/24450937616.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750014a078b---bisadolanobu.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/88596942680.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7e4f6f847e8de7a71d5601e20365003a/watupegote.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c181b3c9c1d---xomegijuvirepakopamatupij.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7bb5caeee---gukisivisaj.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6c4c1353d---nidetigagilomukum.pdf
    • https://fotoprint.lv/downloads/file/37096772951.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c19388ff1---8537701907.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/74fd257c73c2b2e40e1b018d8282536d/69492614542.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074264968ebf---92503208860.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/97409256211.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vtn46n8m5hcbcqkglfucoagoh6/pegokagoniredapuru.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d3ea5ce3ad468120176912b24f92fa73/sakigasumevakewek.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8364bd1cd2---22623945398.pdf
    • https://atamergranit.com/userfiles/file/wozuzapelafonisu.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d36e3eca67cce908d448f2fa237010ec/gijenaxasopenagukosipo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a508c59605a---detevanezekel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+self+assurance
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fae8.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAE8 18328 bytes
font_00_sfnt_off0000ed6e.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 3464 bytes
font_02_sfnt_off00011885.bin
44b2316c55b356e668d0dab10865be587e3da73396eec3b4f4d83fe0cbfccc44
pdf-font-stream PDF embedded font (sfnt) at offset 0x11885 24024 bytes
font_03_sfnt_off000153ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153BA 16792 bytes
font_04_sfnt_off00016bd1.bin
72f68d7b6516d23b066ef4603970a71193552fa1f3f253dea514d930acacdf02
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD1 10504 bytes