Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7e96a4ff21560b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 19:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 302ccba7ad95c4f528a3c3570283c687 SHA-1: 75d9a800e68c665e71e9d4dc07560391ca8b789f SHA-256: ff7e96a4ff21560bcf80a4c944bb112488867bb412a04b0436fb9f1c8eacc42f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on compromised CMS uploads. The ML classifier also returned a high confidence score for maliciousness. The presence of these links suggests an attempt to redirect users to phishing sites or download 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 https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/hb3i2bs0q3qtrqvt2qm67q54f6/giwusilifefuvo.pdf In PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pt9k4771ja8eujleki568si8nb/38630099536.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a8729e66---masawezidisuranevubegibo.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210728075403_1298450743.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/40474051336.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9e5e8b15cc29dba691266a7864a245c7/44597178586.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/riratovimujerizifimatuku.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b4e4deae---9996365502.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/75804e71adde7ad9ee5a34099806ff1e/10271931435.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082daa6c04b7---kikewonepefumixemor.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0e45744a790e25f5dac2929e210cb65e/90865551827.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/70385756351.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/97823463176.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/13513102119.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/49204116884.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/firanujunarotepufar.pdfIn PDF document text
    • http://modern-pro.ru/files/file/6668919815.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/varunixob.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/dd0bde0e63029ec3bbf1eac1643d5dbf/zijazig.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e9b412a9595da5c73c8cd11c4dea949f/namoderobemekusuromubu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160af7aeb71a09---40963365335.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/tururefugulu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c87fd8152e5ffad8cf7d7ef98b4b3307/tonazowufexupog.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/boxutudidaxunemakuxoniguv.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j19ndbko0kf047g2al1m2fnhk0/74221977853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=geography+notes+for+ias+pdf+in+englishPDF 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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10932 bytes
SHA-256: 156c808aa0f824e8a47a6f4d8557c37fa4025ed1dfe52ee149f071f39fdf4b86
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 18024 bytes
SHA-256: 1d27a3059fdacbf145c1c0d2f296ef23dd78fdf433650563f37ad1d2e5f3f7ae

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