Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5df4c515476cc46…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 03:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c49c38c2efdd0614f834ae3e930cf7f1 SHA-1: 423309ffbbeb2c5932ebe84626981a620d8144cf SHA-256: f5df4c515476cc46c85dcdde669c1df0479f53d45e293006a37fc268ce47fc69
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Analysis reveals it functions as a link farm, containing numerous URLs pointing to external resources. Several of these URLs lead to compromised CMS upload directories or are hosted on domains suggestive of disposable hosting, indicating a probable attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pro-group.ru/userfiles/file/nexometusomalagunemuged.pdf In PDF document text
    • http://teakdeck.pl/files/file/35343636121.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/17714804034.pdfIn PDF document text
    • https://viettrungson.com/media/Files/99149885874.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/49928988935.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/11145965307.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132788e8b4c1---zunodosexetixawebogon.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/godevofibebixamaxib.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/nefim.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134085282433---84303402020.pdfIn PDF document text
    • https://motecx.com/images/file/9003155238.pdfIn PDF document text
    • http://eko-uklid.com/files/file/67295888981.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021916158317544.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/97482343332.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/27751377769.pdfIn PDF document text
    • http://leeandrewdavison.com/download/8874381201.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a51f8b02f0---xaliminudefexopezes.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mvr1738jpusv9h7u1qbr34feh6/21346856349.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/parud.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/90115103696.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/31241423440.pdfIn PDF document text
    • https://shunnasato.com/35449694828.pdfIn PDF document text
    • https://reha.bg/content/upload/file/xatepenufubixulofa.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bi03lpuopsekf6akd863k2jfk0/gepodaxukojofonopebimovin.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4516cf11---togojubixibomerajepevaku.pdfIn PDF document text
    • http://a-pluset.com/userfiles/26546711531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=largest+economies+in+the+world+2018PDF 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_off0000b327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB327 15092 bytes
SHA-256: 25c16d7e20fc2b9ebc878f40e22fab0100a2f1291d5f8957ea78dd16c9d88e8c
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 11364 bytes
SHA-256: a56937f7ed45fcf0dab18210b2625790c433f89589ea00ab25ef1f2f762c9812
font_02_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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