Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee43d340a9b46eb3…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 08:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4ccd50981265960c48fd935aab58a7d SHA-1: 19c808e8badc702f3fc16b903b8327681c06cbe0 SHA-256: ee43d340a9b46eb3ebd738b67ab10b7d0316368905ca7070d2f8fdd1be3dc201
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2018ac48a68dd138e379f639fcdfedbd/dedosapoxo.pdf In PDF document text
    • http://mlsy.cz/images/file/files/25593810777.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/limabiwipozebux.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/4888372624.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/befolasa.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/h239af4bs7qpiove8ve1oemtcc/72619520060.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/luroludamudajigujanimos.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cde47bd05---waxakajogisupuriwezapo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfdd6b5e7f---varade.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/fakogi.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/fisujesadejebuxu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b6ad7104---27443912631.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/xekuxariwiretuva.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927672f38cd---mutazarefapekoti.pdfIn PDF document text
    • http://allasclub.com/campannas/file/juzeravosuberirazamox.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guposugepanatalit.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2a9cc85bbbe0441bbde0c838a403c35a/31232565298.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/66828699915.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f787385aa677e2e882d3f779a005dbff/15574917113.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/sajukowukegetinoxib.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/pokogumofigutef.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/tuwef.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ldmn4jfl572tpp77q786d9c552/58813768564.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/negawizazalepubedodibidi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/15216324236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=phone+conversation+in+english+exercises+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_off0000b45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 16228 bytes
SHA-256: e2a342a210dc871247d98d6fc6221c74b726775281e718de61ceb1226be4d766
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 11068 bytes
SHA-256: 37c16ac0b1f83528f4eb07d3eb44d794682f3fbaeac7d2bba05a77a0511f0fc6

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