Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3f11b7c9393076…

MALICIOUS

PDF

91.5 KB Created: 2021-07-29 20:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94b0e325f700f153c38b8a44c9a2afc0 SHA-1: a853e285b926aabbb15ffb85448eac10099b9046 SHA-256: 6a3f11b7c9393076d4bd13f476da2473e135657cf6340e6f6bf44a236bcb7ab4
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 URLs hosted on compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to lure users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609629b4e55ef---94252976432.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16224156968096.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25758adc3---kesimeleluwogove.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973a67667a7---vawazodotoz.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1c37b814ad38e33459c7e1aad4f0fb1d/79584116798.pdf
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/51790526644.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hm9lnkm4e1mqrgr5g1isvr5ck1/jusajilupazufevuli.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097ea14af7ce---nopuvoperewavadakumid.pdf
    • http://lamexmarket.com/uploads/files/vusezotaxotuk.pdf
    • https://namhunglogistic.vn/site/files/pafuxagudakokojisowexowu.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92832835474.pdf
    • http://altiro.nl/home/tjerk/file/xanojaw.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef19e4dc92---kepepudimutugoxiwovek.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/tefoferelem.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/74c8ae0ff66c120a67e294d856b9102d/dulule.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/d6d2jng3sdd4bco8r4sopbrav4/31209266933.pdf
    • http://saikunghouse.hk/userfiles/gisitofunadiwif.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/70468857073.pdf
    • http://momsystem.ru/public/file/5706961102.pdf
    • https://powermailer.in/userfiles/file/batidinonudop.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ba0280677---81813263935.pdf
    • https://home-consult.lu/userfiles/files/36249399071.pdf
    • https://motacademy.it/file/sixaroxanuleselivifudojip.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f0e04d3ca28ff90fdf92de25e2cc0e95/49052628173.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=euro+truck+simulator+2+bus+mod+download+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_off0000e69d.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 16144 bytes
font_01_sfnt_off0000fc1d.bin
fb660a77c307f6138f5b428169be30eca7b2a1c0d0b1730ec46aa40d581792ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10920 bytes
font_02_sfnt_off00011586.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 16792 bytes
font_03_sfnt_off00012d98.bin
7669f9733891d2635f019013c2aff445b93312a07b7a0e23135d5b1f476870e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 19608 bytes