Malicious PDF — malware analysis report

Static analysis result for SHA-256 849cda351aadadc3…

MALICIOUS

PDF

94.5 KB Created: 2021-07-09 07:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d30ea508f0181bc5c076a723d40d392 SHA-1: 5323df6aea4c2a62fc6f9f1b2aca6b08c050fc44 SHA-256: 849cda351aadadc37d58c46428598959d65b94c767efac6069a19d1abbd3beda
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://indovinandoilmondo.it/themes/userfiles//files/19967267443.pdf
    • http://groupkaishan.com/d/files/gugikijonabepodut.pdf
    • https://alteanetworks.fr/img/file/kugutizavodakeroti.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a178fd0e595f5d8d81e7338b4c1ae876/zakadigasuwuwol.pdf
    • https://alamansyria.com/userfiles/file/gazosijolikuliwokob.pdf
    • http://leebyunghun.kr/new/upload/board/files/90701840888.pdf
    • http://retroldn.com/userfiles/file/xudufol.pdf
    • http://russkiivopros.com/images/FCKeditor/file/xunamikugepimitonilotobur.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4961e9b3cc---jupebolaf.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd775dff37---sivupitipanoxumorefozit.pdf
    • https://mygrind.ie/userfiles/file/60265194559.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/lanirepejigamobawepiro.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608567ea45c83---341000056.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/toshv4l28t2sfq64j0m93tmg16/62169835010.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a390b867d2b---49876674100.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c18deb4166e309224e9b5b0edd31a66e/19176216759.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a826df284c00fb32892d8d20b9bd76ec/pewujax.pdf
    • http://mosjob.ru/images/file/vexakefesawofazevadej.pdf
    • http://stacjaregeneracja.pl/userfiles/file/324299732.pdf
    • https://arvikabc.com/images/uploadedimages/file/91950796633.pdf
    • https://infrastone.com/userfiles/files/11649966849.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c84bfe44---92358878796.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1019c2ceb3a062f1c68a4d35e4cd20de/gerux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cheers+synonyms+in+different+languages
    • 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_off0000ff47.bin
39c06ec722890cb302beabadffa7d83ab0e8001409239125f028f76e31d6dcdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 20604 bytes
font_01_sfnt_off00013251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 16792 bytes
font_02_sfnt_off00014a5e.bin
ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5E 1780 bytes
font_03_sfnt_off000152c2.bin
39594beb1069e934241ac9c44fc2828ddef66257899f22f0b4e3db0c1b69d7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x152C2 11044 bytes