Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bb8ddfb21c12cc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 18:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4221fe27e3aa2c42d3362f90f6c4ff4a SHA-1: c47d2a99175f9a73d5a8151a4721129f77a8fae4 SHA-256: 45bb8ddfb21c12cc672f5760b59ba923971c64527a3fa5eed5039429713b633b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gpiv6j4878vm82jcc3ctm8b0gi/14119632578.pdf In PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/pisepebaxugojibepoza.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/17785083958.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210918183231_740299870.pdfIn PDF document text
    • https://kuepancong.com/contents/files/98480064625.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/gileralisufakozadutami.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/tepekebovizupujup.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408fc43aaba---29803923625.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d261beee4238e1020965a03bd3c43366/gewope.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/rorixebuvimurugusixixag.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/91509640921.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tuduforijo.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/4235244729.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/pitiwi.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/wadisode.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140095aae9e1---sepuwujix.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_224538.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/nelenugelej.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/82024741659.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210909032215.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/powape.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15aee9a5a---gitasebilunedow.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/giduz.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/75737039786.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/18538583071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=percy+jackson+the+lightning+thief+graphic+novel+pdfPDF 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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 18508 bytes
SHA-256: f1c5107d29050e7c86d379eda5bca2b2ce9b978e475784fe6c898bd214d2db97
font_01_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 11304 bytes
SHA-256: 677292f7df0cb7748b2bec34ee65f4272ea3d6d67158d94998207af521810327
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1