Malicious PDF — malware analysis report

Static analysis result for SHA-256 a844a05cad60b29e…

MALICIOUS

PDF

131.6 KB Created: 2021-09-03 16:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cf34fec3a63de38de1a17643e7e988a0 SHA-1: cce5bf61f983c4fc1f236c6876d46ae168864ab6 SHA-256: a844a05cad60b29e5646b4ef3711e9e8b35e273b021d4f9a9cbb8522a4356b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://allytemp.ru/uplcv?utm_term=adobe+photoshop+elements+13+user+guide+pdf PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51e389bc9---85528515154.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/gosogalasivilojilekimu.pdfIn PDF document text
    • http://bndweb.nl/upload/files/jemikilepizonalorox.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8ad3f0c021b13f53743c618ad1f81d7/43097807061.pdfIn PDF document text
    • http://venkateshservices.com/uploads/luliluzeganegeso.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609203c570cc7---vobolimesaterajunijibe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611960f0e082f---19249532.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/24720720094.pdfIn PDF document text
    • http://fygl.net/uploads/file/030955561799.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/59442277887.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/72304232140.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/sutesivim.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c899616151---30418418876.pdfIn PDF document text
    • https://dm288.com/slicice/file/81457895290.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a169527760b525d07997864dc0cd387d/xevewapiledupatoso.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/60598420507.pdfIn PDF document text
    • http://quaint-house.com/62697664532.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9736978ab---54187837012.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/63521624031.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee37ad71d---kinugorubeferuwoba.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/kisewoz.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/79283143527.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/fawukolutiwuguref.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610574678518c---25475081999.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/58103718805.pdfIn PDF document text
    • 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_off00019955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B16C 11228 bytes
SHA-256: e237ef360b62b439b34aead39b7f993e9ec763806c712b9b07a581b0696403e6
font_02_sfnt_off0001cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB28 19752 bytes
SHA-256: fe10883befbd3e7bf8523fe4d35ae41089927d8234f48ed6b4accd6e5b059b6f