Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d27158f5264590…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 06:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bd68acb93560c759b58f7e46872dd17 SHA-1: 8effddac14cd87186014a2251da76bac19855903 SHA-256: 55d27158f5264590c8ed5fae3e7b727e0c5011edeb6e065f8cf93922adc37561
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.nomorcantikjoss.com/file/norizetoziwelivu.pdf In PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210608160329.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/fodukomoxanagawapor.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/texazunowadegelez.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099e59f743c3---41842592254.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/21440053426.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b89324da02158c5e664e975d1fb01bbc/loxedibabeb.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff0e7ccd1---jajikimijimijejufumu.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/87039492296.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/46550637367.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/nesuka.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/20120588341.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210726_0411833A3399474F.pdfIn PDF document text
    • http://mayjack.com/upload/files/xuvipavum.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/tasadikawetagakad.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gvpvigoqtb1dp8bgeid6kt3ro5/43142021923.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/30081319253.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/fegoniruto.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/rizotor.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4182a9bb51---dabakelogotebujo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/79053510794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bronchoalveolar+lavage+cytology+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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 17172 bytes
SHA-256: b342519b263a7b162f07ff04004d528dbe2867885fa01775121e870057b56df3
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10872 bytes
SHA-256: 983d2cf8d811189412967fd4427f25f3006bc16659c23a71081369184fd23113
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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