Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9c7da713f10c07…

MALICIOUS

PDF

81.8 KB Created: 2021-08-12 06:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88130d84bc29fe719a00a8068ab7828d SHA-1: 44a7842299ba8df491f24b3534cd044f5e0dffae SHA-256: 3a9c7da713f10c07c3ff250f930e541db7575335f84fc4e6286391656af416f7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress installations or hosted on disposable infrastructure. The presence of these links suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=electronic+diagram+symbols+pdf PDF link annotation
    • https://an-professional.ru/img/files/file/likudafedupekewuw.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/26332148828.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/78955316374.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/78733275890.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/77870213265.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/22649333415.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/61535210495.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11ed804e4---sitivevefuw.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3f9f3b6b---takisuxig.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/712e837dc67f19bbdf76b2b56a3cdb38/kijisosogaso.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zimevewugefonuzed.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0618faa---28147653786.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2685cc757---95838993427.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210607081755.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b9e8adc9---raribavulurugaxa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609c87a1acf71---98823746031.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33412437---tupusinixazowepiboxanomi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/77020910044.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6c0dae58111b929fd54f7b96e6874193/42833756284.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/labozobur.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/buvitobimed.pdfIn PDF document text
    • http://atrsara.ir/resource/files/muwalotuberaziwukebifuse.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f34371994---26359887902.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/40858006053.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dfe2f5f2c0befc8d62216f009b357a88/guwilurokasozemafow.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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 11200 bytes
SHA-256: 00a2361d5093d321d2963f0b9bd5beb8fbee26987771f6d8ba629c538f28ee92
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 16716 bytes
SHA-256: b87e556d545f9a75e9d65d505299406cd2fa245cd4fcc9676ecd4dd4b9dcf5dc
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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