Malicious PDF — malware analysis report

Static analysis result for SHA-256 7167dda0038338cb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 21:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 613caf6426dcf0ee3399bade4db4e5bd SHA-1: 9e45c7b3b45fe7297041618067f1a128b56e410c SHA-256: 7167dda0038338cb7e98220ba37e7c8b3a21ac7381c78bd686b84c2acf393534
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document 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 multiple distinct hosts and UTM parameters further supports the hypothesis of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=entrepreneurship+pdf+grade+11 PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8529ee8590489b52ca2b974a59c8e355/vugurimuzinoluk.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607451fd82cc1---madupidagopomalamofo.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6pgq6aok7j1jaugour9odm3100/venijinawesigog.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/81452695340.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/bufebowelekedezediva.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/moxilim.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160969f3693b6c---20010794549.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/95705314588.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/jusapogotenafagunuzumegol.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/97951718397.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1d8b3b01a0d4381b3187ffd7ad6a293c/foruj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6469d5924a---28736916780.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f2e2d3bfd87fa2a4f1bb780638fb0233/59456269249.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6d21fa71---posonegepipuxoxotufadon.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/08f4d654e983cf5f2fd7d893e5f4f081/84589025297.pdfIn PDF document text
    • http://www.heksan.com.pl/file/fegakodupazokisugib.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/49217951591.pdfIn PDF document text
    • http://4yoga.by/pics/files/96203993116.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb3ec65ef2---78177940378.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850630db695---sisugogixiwejowik.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6ca7fe2179a6f67ce4becea6bd6445cd/kimuvaxizuxesufafowuxo.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/nizirofazazo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/550dd79f82ef85c2866a4fd0dcafb4ad/depijode.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_off0000c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC049 16676 bytes
SHA-256: 51fabf5149f92c0bf7ea404f8fa3f4818a0e367999849f978b226e6232ce35f5
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10744 bytes
SHA-256: 74db85e2f4baa86e4ecbc9d662d23dd559e0f60a8b763a935371241ce55fc20a
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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