Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d907dcabf3312a3…

MALICIOUS

PDF

103.0 KB Created: 2021-07-05 23:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c9ae727d3602ba1e158f5cc95fe9c3b SHA-1: b6d5f41c68adf65db4752b3fb9afd81c33a20cf9 SHA-256: 8d907dcabf3312a37f84271b60508ec4415cea26e7bcd466a401cd763fa0ba98
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external URLs, many of which point to compromised WordPress sites. The presence of a PDF_RANDOM_URL_LINK heuristic firing indicates that at least one URL is algorithmically generated, suggesting an attempt to evade detection. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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 https://catamma.ru/uplcv?utm_term=shot+list+template+pages PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7259f4d983---32479916374.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/nogavugogipagutagemus.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7360be935---55208702688.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/xeroromasogasamudebizerun.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/80781760089.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609410cb6de10---bexanupenegafalevijar.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9fa56da6d53c26ab06c6d282e805a8b9/kerazisigunuwafo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0s37aot2r3jrstgjpb1nltilp5/44365376671.pdfIn PDF document text
    • http://3sdent.com/upload/files/42881797783.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tirirasilolekojojozu.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/lezaduwixibefa.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/710837e4703f0ff088b288722ff8c165/wesuvonotuxelalidojenewon.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/98hqshd0ile10pl2hc77vuiiqf/duwepedipopolidun.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/17000536334.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/47159332898.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e1d8932a1a85a912c7e151985275be8b/15626578293.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/jidibufif.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/42040942369.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pewubiziku.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0722721001624793085.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/savemegazojederizegefok.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/vjvv21q8muc7c4pdaodtpte484/75278171734.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 18392 bytes
SHA-256: 1803cc38377efcccc2450aab0402d7c39217c0c991e7a2f01362e6bd22974cfe
font_01_sfnt_off00013c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 10572 bytes
SHA-256: 193e3a4791268aeb79088fad3a6da3b94c970d2b6ef4868301c4428b8fddb657
font_02_sfnt_off0001545d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545D 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off00016bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF1 2252 bytes
SHA-256: 09addeb75f39ef01c72f38ccb3b1c9f6bff4dbc821359ea601ab83b7620a7d65
font_04_sfnt_off000175ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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