Malicious PDF — malware analysis report

Static analysis result for SHA-256 725a2a81432439b2…

MALICIOUS

PDF

88.1 KB Created: 2021-09-11 02:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 55164635da08c660391edc4ddced7d76 SHA-1: 8fdce89a2ad662d4ee31bb8def6fe4960d6fcc72 SHA-256: 725a2a81432439b282db6c9e2abe005c5dfb82be4cb280619cf09f1d3de4bbd5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://leanuslab.com/UserFiles/file/beritewijoz.pdf In PDF document text
    • http://amandamaitland.com/images/file/49029527983.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/60409593780.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/wumowamesabumof.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/32581210382.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/babixajezavatogu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/zesavofokegekefefor.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/naxol.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/32978331122.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b341c2cd6e---15900725712.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19437464222.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161354e26a217c---nigamavet.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/kevojevoseveto.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/63324845264.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/lovutaliwibepemutujuzef.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/bemonegetaxojowipepurapu.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/lewedusogodo.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/92496800701.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/43379569993.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fapitepodojudedukemimoja.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/sovijalutudalojofu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613950b3f075b---sawixev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sistema+operativo+android+historiaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10752 bytes
SHA-256: fd38d5489ccff75ccc13f108bb78b629e3deaf971925bf2c31a1dd8a569b3de9
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 18640 bytes
SHA-256: a90200515364a6f3061cb57cd9d9ac779f66ce7bb58e16247f597ca389f013f7
font_03_sfnt_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 17636 bytes
SHA-256: a361e1bc4834d2598585197d613562f9233bda8b5dd8e1e68c7a7712ac7a1acc

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