Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc52262fd3061cd…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 13:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83f1045c6731f2777bbdf4cf6212b5c1 SHA-1: 990da5292866c01a902ed936572c9316419d2dd2 SHA-256: 7dc52262fd3061cd719fd8ea8f508b40133136b7054b2a484404a68c60bbd041
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links further supports the conclusion that this PDF is used to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aulacvn.com/upload/fck/file/wigej.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6bd8d64b0b8141163029a897f118073e/65351943916.pdf
    • http://fw-simple.com/uploads/files/14749160154.pdf
    • https://aronabritcan.com/userfiles/file/jukisudoxekid.pdf
    • http://intelekt.biz/uploads/pages/files/dukubib.pdf
    • http://cartopack.com/Images/file/824307686.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcd1f3b5ac---41167472001.pdf
    • https://hondamienbac.vn/userfiles/file/97254826423.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a59cbadc534---pilikazusozomiwa.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dd92f6d6a1e718bc6a2a1fa6311d0bfd/72989195.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/8e9jpajbtlsokvuq6hievnooan/lozokonerojifora.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae1bdf397---74871614099.pdf
    • http://thingsantiquesla.com/userfiles/files/tijobo.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c404a889a7---77720719906.pdf
    • http://mai-colle.jp/userfiles/file/xawalaviserij.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/79dir7prkhp6mvsf539pe98sj2/59130016688.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ed6791b9ff2481d6a485f1e754157ddb/woxugiv.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/10736078ba7e9bc009f3ad15e4b9234b/16394784892.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d661ba681e---30370176151.pdf
    • http://controldellaves.com/app/webroot/arxius/file/silib.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ddff67768fff645dd0127b7376425f06/wujakomatevavufab.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adfcf19ea98---72806273092.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/25593588536.pdf
    • https://knurussian.kr/DATA/upload/files/202106301557319755.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/459280f83272e806424dd01e90e70ad4/60805667115.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+magnetic+field
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 16792 bytes
font_01_sfnt_off00010396.bin
09a8b503ac446cdc6f9277005ed9176597db84eacbb6b99b1e87f67dd124102c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 10940 bytes
font_02_sfnt_off00011cc9.bin
afd59b1c3612eaa2e074f1208d083d2b77287d0bd007c30da5e2c44f831b65a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 16904 bytes