Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c3401f09b48038…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 06:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35135d3c86e8df5c0964753eded5428b SHA-1: 4ba060754b2b2b423f0e10a7de6acaba432c8e5b SHA-256: 67c3401f09b48038fdbc2875ef618ccbc4c6adeb9f9e092f5ea9f8c719d9b644
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs that point to external sites, many of which are hosted on compromised CMS platforms. These links appear to form a link farm, suggesting an attempt to lure users to malicious destinations for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/140858812310702dff4a2eff1237de74/9202088083.pdf In PDF document text
    • http://szentimresiklos.hu/upload/file/47534175000.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983ba28eb41---najagupepupeno.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/1438338213.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/81794213489.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/11qkfd0tc1ebautdbclha7vani/38155561473.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kogosul.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xudadaporelexewuzuj.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/lenufejugubu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/50471617149.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae7f82d0a---zesenagesesoxijuzikoxizu.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/22612537519.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/fazupetodetasepokewugidad.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ae16c2389726782bca9ad74a02a3da46/18389310004.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/97919056708.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393bb3c34d---38523427527.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609854ddc6771---92293288284.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dac2fccd6490fc02bdfa0947c1148758/jekifosozanilikevi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hv9i2h8ch8a64mj3vspv01mjn5/76266809536.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e54fae64d26---5096397760.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/64535721655.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/s7a2r0l3rpf3b87gq50etgv5o6/pafake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=e+z+nomenclature+examples+pdfPDF 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 17796 bytes
SHA-256: 87fe5e8e5e015013404c193fc0dd4487dceb51a8b99305dbb42b955ed17c2f6a
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 10932 bytes
SHA-256: 521f69b9f73c5c25bb33936b453ed877c6b6be76e65fb29a7d28366abd242a6a

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