Malicious PDF — malware analysis report

Static analysis result for SHA-256 535fc1dd4fa66849…

MALICIOUS

PDF

122.4 KB Created: 2021-07-02 10:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e8305a1af222d8367c29125f9d82b5bc SHA-1: 939769582d9350e053811441f8fe3a4ed1f71077 SHA-256: 535fc1dd4fa668493f58686eaa1e7e8681c42fa34707ceaacffb007282d4c31c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the file being a link farm hosted on compromised WordPress sites, with numerous URLs pointing to PDF files within plugin upload directories. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it's designed to lead users to malicious or phishing content, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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 https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b159f961b88---wofalufimejojaruf.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/302136575eb9c8dcc263696931da7835/3235369858.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b639a9ccdcb---lorugilaridosinomanojeba.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c0c9b0433d3d5aed8012c8967ab0d049/44217802707.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6cc501b6---jetikejoluxi.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983c8807852---telebek.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/lopixititewezadame.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b43da866---35378230809.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c319ca6c91---93308057121.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zebes.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wolobixixo.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/vimuwozivobeloxazoratiwal.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/973hh8mkjsq4ofkpulijfncpc4/futigu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddf2e819b---67843417255.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/38209985590.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/zuverokufolesemejij.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8785372780---90793405812.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9a96ce68bc3a9567e9f480b7dc192dd4/rixixeburu.pdfIn PDF document text
    • http://isgsrl.it/images/file/91612214948.pdfIn PDF document text
    • http://jarosi.hu/files/file/33017266242.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/10e5a1bed5ecc40e371f689011315112/wozixadale.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528152404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hello+in+20+languagesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 10420 bytes
SHA-256: c620d3174409eac3c844034c7fa86ba1df43512838f06245c15acd327c42a8db
font_01_sfnt_off000141e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E0 6944 bytes
SHA-256: 85db4c07b5768c686798073cf9623b61096bf9cc178ab6aef183ddf3c3d25c32
font_02_sfnt_off00015a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9F 28020 bytes
SHA-256: bd00afc7be4a9110caefaa19a97e98dcf1fdd47d9ed1ad10987199aceb08b222
font_03_sfnt_off00019f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001b780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B780 20352 bytes
SHA-256: f253766eaae27ca45bfce51c3d9024c0254331db3ca43b19fcfb11a578771bd8

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