Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dc6725e4a4a400…

MALICIOUS

PDF

90.7 KB Created: 2021-07-18 05:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f59393a30db87b7dc02f33446fcdb1c1 SHA-1: ebaab1f80d6221802e695e82086057556ac401fc SHA-256: d6dc6725e4a4a40067d8bc00f6430e9f16e534e89ab66c537c30b1cea0e2b552
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of external URIs and link farm structures indicates a likely spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://a-kamen.com/userfiles/file/26467338602.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844e420b2d---xegikivuganab.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bd8f71646d341d5dab8568f0d5cac65f/68439932382.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6ad099452a04d487b986770ae386ea5a/68016803878.pdf
    • http://ros-grad.ru/fck_editor_files/files/tatogefidujolebawuneno.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9747c0c9---27046319784.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c139fb30d0275424ce951a7f6d5af590/58110566961.pdf
    • http://tc-antey.ru/uploads/files/71002601522.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b0vqgmk8uignhd8uc8o1c18e1/35328569670.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/1888831800.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/xaketubis.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/43b142a664d1f5d84d94398fd49ba115/rumaxinexatazotipesufege.pdf
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/zubuvaditipopo.pdf
    • http://tcihk.com/userfiles/xukodex.pdf
    • http://gsxr.hu/userfiles/file/39342953544.pdf
    • https://wfca-czech.cz/temp/userfiles/files/fulamafonazag.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2d40fc474e3ed4b26502f8bf0267753d/19836658287.pdf
    • http://cuatro-pr.org/sites/default/files/file/86944272290.pdf
    • http://thailaundry.com/imgUpload/files/28308728801.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b372a9e58---18694120342.pdf
    • http://ks-puyuma.com/CKEdit/upload/files/jabevaduwareto.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c00619fc8---jigemutit.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a937ca4b---xixowozogago.pdf
    • https://flyfinz.com/userfiles/files/67745765447.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=full+form+of+phd+degree+in+english
    • 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_off0000ff8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
font_01_sfnt_off0001179d.bin
8aa6b54b3be2f3a77e53b1b1ffc6b208f575fdffb9b00ec2e544b598a2163fca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 16920 bytes
font_02_sfnt_off000143ad.bin
7c9cf25dce1c3d184eb3796dbbb6c076ca40fd2c6d7aa363024c3bfde89bcf3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x143AD 10760 bytes