Malicious PDF — malware analysis report

Static analysis result for SHA-256 016b86c9226685d6…

MALICIOUS

PDF

93.2 KB Created: 2021-07-21 08:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 585f4a6f64b72487af73fee55b426ab7 SHA-1: 951d633dd4279bf05eea8e25f852a5be93ca0b0a SHA-256: 016b86c9226685d6ae0248183f21e0da42a578c411b6a072d0f147a96285dca0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and numerous embedded URLs confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://robwalker.net/fckupload/file/tagukofikisisubekukugal.pdf In PDF document text
    • https://namhunglogistic.vn/site/files/tavesenoxugamep.pdfIn PDF document text
    • http://agrion.org/upload/fichier/14060745635.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48620d9b1---kewesavufuru.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb3c73a4b---naruvamigifalobovuvid.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3daee988657cca9f5a1943c2e60a4368/26081970579.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/63280628664.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aade7ec6ab8---56010057627.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc5c7c091---37533186.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b34bdb83f17---vakurazagukafufufetone.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/32347923070.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/27126138087.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6367ce79bd---71161113416.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/21458827232.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdfIn PDF document text
    • https://zold-kommando.hu/files/56374474084.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/lizexekidamigudi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8rh5k0mckmg4jr62ivberpv94b/kepolijisuv.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/sabivumanesuxumusote.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/wazunigulugamivanigi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/migemejuzonuxumabese.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/98007252252.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/4966124920.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dbc7caa58---vatekurarozemiweruker.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0c6fb5e94bf87206d298c43e8cbc342c/25698196316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+be+a+3+man+audiobook+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 18132 bytes
SHA-256: d11d1845a6d42242210caac7178c160930cf46552111b77eb31afe2f8c5cbcfd
font_01_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 10928 bytes
SHA-256: db2cb9bf6646c33feba0ded38fbc6f47cb382a27ca9d00989390eb44d383c017
font_02_sfnt_off00014d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1