Malicious PDF — malware analysis report

Static analysis result for SHA-256 17421b2d6e5745ed…

MALICIOUS

PDF

85.7 KB Created: 2021-08-16 22:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a301514c6ea67779df3030b11a513f94 SHA-1: 48d4b064df475e7bd3ad3d99d37d34f81047c2e7 SHA-256: 17421b2d6e5745ed72ab25aef5769e0393ce3429af8125af102dc04e521e12ab
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites hosting other PDF files. These links are likely part of a phishing or malware distribution chain, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/aa0a587427f86899fe75ee509dd8bc33/zabipunelojiraga.pdf In PDF document text
    • http://chayka-svg.ru/files/wupikumobof.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/918a66223059a4bade7ce2e4fe4fa489/suxukojamasukodexop.pdfIn PDF document text
    • https://digireg.es/upload/8920414018.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66510735648.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba795d90ae---vimakowuzuketobetu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/tefvg22fck0artji4hfsjtpp13/manoziloligekulerivapeb.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/1h6ogmbeinn8mp5qs52cavv160/kewuwul.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/36907247849.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/nawasufug.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7918ee1f2---91967055290.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/50104352236.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/67878fcca24f5e2adcbe9157ed771768/56347223908.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9afb59ab---24511899188.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1282e76bc---87870517235.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/14081907418.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac864d16d18---ragalikulururexekeponutid.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106213e6d837---96828755630.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o233iaf98mnqggputbu4lmuha6/kivovaforoguwe.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/dd2e1f6b43ac6e8e53ad0855a40efc29/vobinuribi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe649c6b9---sifurimam.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/74524015579.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/vuponomukirurosujisam.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ebc6b4ee924c47f7dcf0cb495e811bbc/97895637736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=avery+8160+label+template+wordPDF 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_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 11128 bytes
SHA-256: b54d7e0e0293c667d724b25286d7054afbbe22a40a27f15b39f5040929b1f305
font_02_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 18172 bytes
SHA-256: 90cb01e6a238b1dde70c68a6ebc564601497dea11f6df322dee80cca3832fbf9

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