Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8e7c07fdb5d401…

MALICIOUS

PDF

84.0 KB Created: 2021-07-16 07:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 19c5e81f01f8530f5812b0e234b78a37 SHA-1: 7009bcabfbcf697fa27d8891d37e30a717b394d5 SHA-256: 9f8e7c07fdb5d401f7e023b29db9e772e031537163f619da0a226db03769e52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs imply an attempt to redirect the user to a malicious second-stage resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=7+habits+begin+with+the+end+in+mind PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0c43efd7d0906df1286b93a6c5d09973/72525204313.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/migosorigeguk.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f46914b92281eae6bdf4329d8bf997ec/31925002921.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfb67e7a08---37169273609.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/11077622808.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7aa3a747d109451f3d60185d311ee522/juzawirotedokeloma.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8610a3d754064de579e546d257a4ec21/bubemejudi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/q8cruhegsnctivr0kbdkphjkbp/togev.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/59511171207.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b0b295a6---pitavugon.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/74516832383.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/mopegovobuvuxowelit.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387d4e40f9---senadavep.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b66817c53fb---renokelepabixadakakedulu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/92543010813.pdfIn PDF document text
    • http://cjatkinson.com/userimages/91862227751.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4142922fe7e1351c3a1e77439df4ebb1/mufaji.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/53118561797.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fcca25779---guwukodutibuj.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/xijajitezu.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/zagonikazenolapafuzeloni.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/99310758977.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/50739436926.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 16420 bytes
SHA-256: 7e735668199bb105fff43a82cd9b279c30c451d1587e3ce38d78f38c909b12f9
font_01_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 10608 bytes
SHA-256: 9c4338d96c6e8fc39d34c989a56230e97b223831ff8006f61d8e872ca3639a23

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