Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf42019c1aed44ba…

MALICIOUS

PDF

84.5 KB Created: 2021-07-27 21:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fce8cbfb4762e43e3fa25ccc841d6d8a SHA-1: a5c68af66cca298f8ff40f1fe30dbb42436a0fb5 SHA-256: bf42019c1aed44ba3106e29eb3bfd9eb6f6f347145e630cf2e5c3c393e3a8205
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to WordPress sites utilizing the formcraft plugin for file uploads, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of numerous distinct hosts and the use of UTM parameters indicate a coordinated effort to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f062dfe60---25949852724.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/52342634656.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfaac6ebaad---nofomedi.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/tuwufulododot.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af672ca1112---pegikonepati.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6h67q8gh3rkf2gsbug0ldt7g5k/dixogilovetoz.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfc451be7---23960702894.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e2331b73---pitodupid.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/60lagf38f3lanmgk4jelu42ti1/guxojukejirevud.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kreric9b4mjg9aj1ev9mandt04/59095546013.pdfIn PDF document text
    • http://aquatherm-graz.at/files/gukametimerijerixadon.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/11962268621.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/godivevuserum.pdfIn PDF document text
    • http://www.siposferenc.hu/html/vufuwof.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050303354973499.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/818fbcefc2ea26911898ef7f1b9dba09/16948423552.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb212a52d4---63025843920.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6823ae161ea585813c85803f342ac921/51009292215.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51652143623.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f539397647---genokedogot.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/282cdfc544329eb1e58339afd8fee406/julajavidajideziros.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/47538038313.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/lobimubuxifusoru.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/66949e20c758e3370648ce3acbcf0023/15355239149.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/40844529258.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a81e3c691653509cf70a96a54cd11d43/tivono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=metodo+bastien+piano+para+ni%C3%B1os+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_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 10784 bytes
SHA-256: fe3ed39b12232f5b6fc13977e0c2be7ba1174c5bde372a61831c9b151e61d460
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 17736 bytes
SHA-256: e253fda786f694718ac6f0f412f02d2b13d53520ca2bedf69d5283c26d102214
font_02_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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