Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7a49f9f6147e22…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 13:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbf142ed3ecfd4509d08f5226ae2d047 SHA-1: 551000f5a7da3207f93b0f79a7fc2020be9c46e1 SHA-256: 1a7a49f9f6147e22c782e9677ff162d0bf0f7976b172b12337f17d7af1ad3301
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and other PDF files, suggesting a phishing or SEO poisoning campaign. The presence of multiple links on disposable hosting and compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f7p0hct75kkp9pjlkmtjokelp4/zibebatewiramirogogujaxu.pdf In PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/riramuvakagabazi.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021082609215084.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a8864931---nejexebovuroganufibalif.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/sulamagup.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5884192874.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c1a0ce15---pukukowiwedolo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe72242c1f---83730154154.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6mkjrtqrbjlhm18lig8biiiig6/figufali.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/295850708.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/18254832357.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/94971786032.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/bamalidixosufefudux.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/10672383442.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/39132402428.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bd371218c4ce72a2fe157cc668ddf1dc/89031897621.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/161c09fd802b72c5c7c72f09ea6fab38/felibixaro.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lajogilazuluw.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/xigirop.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160822b0bbce5a---zepalotelosovemawofugila.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/virifowokudujivawudivowix.pdfIn PDF document text
    • http://intertribo.sk/files/xudugomu.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/56724504222.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/pupixorexakedafub.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/01625a2ac7dc38ade1e4cc6c0602c658/mupigomajasoramivin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=induction+training+manual+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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 16792 bytes
SHA-256: 05e00917583be4a0411884bf250fae881e11d08d467001d56b3984ff3d70bfed
font_02_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 10712 bytes
SHA-256: 28a26ceaa1db62705bd05fa2c9588553c0801a4c2822748bd492b103089ef0e1

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