Malicious PDF — malware analysis report

Static analysis result for SHA-256 b586d4e5a651f7f8…

MALICIOUS

PDF

87.4 KB Created: 2021-07-18 02:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d483b2bf1566f4c9ed3dc1c82ada5e05 SHA-1: 1bdaae395a8f3b9f57a5a702ab3a36d0cbf8ae19 SHA-256: b586d4e5a651f7f8cb1d63b1079bac5a11f0f13db356b753926d3c1ac5b04e98
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of multiple distinct hosts and the use of disposable hosting further indicate a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beautifulmoda.com/userfiles/files/37463986773.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6152b536c---segenilugofezozan.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3600f00f4---89174699743.pdf
    • http://whuntex.ru/userfiles/file/39805192723.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe36e652d0---dodurovatijafomeweba.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968649cf7d5---memujijasexalufuza.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bigozekodina.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c686a360690---42990343431.pdf
    • https://eubeer.vn/uploads/files/42444790890.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4bfa6f6f443d282705c63e725ed355e0/42029942520.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sqk9burm4egj5o3oce9814n11f/dopan.pdf
    • https://habibitours.net/ckfinder/userfiles/files/depomasijekirutimugo.pdf
    • http://agrion.org/upload/fichier/mijajirajofimefubemu.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/bikakurejefamiwizevi.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4gagffsnf93gj89an9ucc92tc4/dexaripupew.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e5717709---valufe.pdf
    • http://bronia.org/userfiles/file/2812915037.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919be00b195---18750764015.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708ad08bed0---nugisorafalovozemasaro.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942bf9296b2---zanuxapa.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/761kms2qjeuh640aocq24s86c3/64324551680.pdf
    • http://strahovka66.ru/userfiles/file/42140251543.pdf
    • http://j-line.ca/fck_upload/file/zaxaluzifavazuwakatodapu.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2adsaei207v9i7iltm3m0q44a6/saniserituzufijejufu.pdf
    • http://ramenzoni.eu/userfiles/files/76273824461.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=not+in+the+foreseeable+future+meaning
    • http://perfecturology.cafe24.com/upload/editor/imagefile/97413543591.pdf
    • 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_off0000f008.bin
f1d01555ad9ea5819cdca760821254e1722cdd656222c8edb7099883178c5877
pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10880 bytes
font_01_sfnt_off000108fc.bin
bcff4849d7d352c85e769a1ad61f387097839c985622c181c2deada15ae985e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 17876 bytes
font_02_sfnt_off0001382d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 16792 bytes