Malicious PDF — malware analysis report

Static analysis result for SHA-256 a434e906089fd48c…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 15:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1bd0ec2c8dce3876d1978a0e477fdc5 SHA-1: ae266ab1dc5dbeed9690732f8d8e43bfef1d40ed SHA-256: a434e906089fd48c35a866b0cc7e08a5c4a699255e9648ad0fa16ce584bf7fad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156edff23032---jawijamuwafafefumudegifom.pdf In PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/80248951459.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/kibasa.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/gumobosunige.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/besajudasumonef.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/65069281324.pdfIn PDF document text
    • http://short-story.ru/upload/file/xodasikigegixufurevimazo.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/98457502081.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/wawewowidox.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/bilavimoveminesebutubex.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/zavasefekezuwujidojem.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/xuretoxizajiridowijuf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ff6e5bf8---vigivolulabizaf.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/sobuguwofipodu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddb0a9713f---97300982377.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/delolimefog.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/81d1835260922ea5909475da5bf84a1c/34616277185.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/pabolup.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/72407502447.pdfIn PDF document text
    • http://balone.net/_upload/file///jixamip.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/fadadifebunutedaruk.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/36433073838.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/juloxugosapujesuve.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/44757351209.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kurovazupowarafowedomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tubidy+mp3+download+songs+app+download+musicPDF 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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 11100 bytes
SHA-256: 0a3102f4d96602647a46161e0820ea865163b6216b46b232f7f98788341efe71
font_02_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 14444 bytes
SHA-256: 0e9ab59ebcd51bf5fb2f71d1b2eb9581b85cb73a7f870e5006807645770b85f1

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