Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c179f5e33b04c9…

MALICIOUS

PDF

85.3 KB Created: 2021-07-31 02:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 429480a8b29ec1b1a49b143b0b08ee21 SHA-1: b9c6b3de30e225eaf51a3e8667510b899ac7692e SHA-256: 87c179f5e33b04c9ba17dc9980c4eccc8150ff15650ff7ed02615372b653d53a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a661a7bf1e1---jupofagejom.pdf In PDF document text
    • http://shannonlakeestates.org/fck_images/file/sezebetijaxiguzobapenosig.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/kavusobilirumufu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a800b8385b8---62472469974.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b2140e714c4c734a8c24ec5d18013798/38164930491.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734793916f---raxifevezizosunove.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/nenugujonekusosi.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/11955332517.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/23306755089.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/wikuvofakuzotobifepapigi.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/28972339975.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/in3pqu4r837jv4aab027n8pj0b/noxabedurowabevotujarum.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090507cea8d3---dujajesimaleteleremavixad.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a362791f8ba---40680489297.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/jokex.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/48310089148.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/fotiligisigolad.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625883194.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/titefamowejewimofunalor.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d3703e2d---77503831973.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/23631488739.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3bb5c50f3---sipegutusakutig.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/refofidawewureritexegesa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a197bea91---96658928357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+see+saved+wifi+password+in+android+7.0PDF 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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 10824 bytes
SHA-256: b98828848035c8a914eeeb3bcdbb698f390f6e009426ce0425fbab583a42bee4
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 17120 bytes
SHA-256: 0560596212006fbb1b8c2239490610b65ba3bbd239d000250ec3895db5b5e455