Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be439ce1f6f0f3f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 09:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29d4529e21e8f04ae0c02e81b35873c0 SHA-1: 29616f737ceac6582b055194cb2432212d2863f6 SHA-256: 1be439ce1f6f0f3f897d5953a316a8deac9b82f4d066acf04a7552f19a6c5c94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://anfauglir.com/images/file/tefadiburijexexumonis.pdf In PDF document text
    • http://ambulanceservice.pl/userfiles/file/58037128306.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/diloxepobobirujaja.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/74988028662.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dqbaknv3t4je3h5j5bgodlfuk/46127326471.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/17029220279.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/311842003561.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a8d81258---83083712459.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/86889ea13b51410ec1ec2ea9b6a19f8a/49986542427.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b990b0262e3---zimekubizijafurekomiw.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/52119231639.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/75132137117.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/9596320599.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ba12c0a7---51287943430.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210826_466CE7F4789E0088.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608802bb39dff---wivekotizisajinonunadanuj.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/4744360460.pdfIn PDF document text
    • https://losungversorger.com/product/file/85515643634.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/17327389239.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/bogako.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4e790cfe062ebe15d1302394c89a380a/jixutimewasudek.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/sasumibaz.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/63501369065.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/tovaxibuwufinosigusirofu.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/furum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+origin+of+the+word+alcoholPDF 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 17520 bytes
SHA-256: b5f3a20f205bab99b542f418eb3c089f569ba7531bb86404acdf6d5939ad31d3
font_01_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 10636 bytes
SHA-256: 712c7f1fc6cb5d561fb8c8e577fe274824a3e7c2ca896a550ffb65388cf2692d
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1