Malicious PDF — malware analysis report

Static analysis result for SHA-256 08158b0f6dfa489a…

MALICIOUS

PDF

86.2 KB Created: 2021-08-26 08:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: daffbe6d1b5275dd6890292101a59fe6 SHA-1: 8385b65af61bfad21db01958dfcea950b8f987ff SHA-256: 08158b0f6dfa489af395d5514167f21d09afaa648338809bff0d6f785cb0eca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection attempt. No scripts were extracted, but the presence of multiple external links and the overall detection pattern point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/56bc31813578e67c47712a7435cb20ae/wugajelasaputebakoteto.pdf In PDF document text
    • http://findmecakes.com/userfiles/files/kugijor.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/10792049482.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5be660dec---53244914750.pdfIn PDF document text
    • http://vlajamo.cz/images/file/50743449789.pdfIn PDF document text
    • http://juentai.com/userfiles/files/vumejemel.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/52159235273.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2109cc04a---59988071550.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f7e8393c1f0daa77420772e249777feb/duzonivabegupafajexin.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/35277168970.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a313995adf3---nonixe.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/giknd9bndbu0d7sgdfknp5i4sr/14343611939.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3ue1skkb8aatporqkf647ca3av/desurokowifa.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a5568164---29739257695.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1ccc258eacc49dde1f03428ebb438880/papokixefesure.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamowugasotibijagiw.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/19405622073.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78896839620.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/c11f2faa075c207b8549960faaef148b/6717153094.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b65a72024d0---47733024768.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/lofanoneribomij.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160898a3e744f7---ririfik.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d04e3f2b59024712c85d70661adaada8/86033910179.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tuwatexilukizop.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vf3jtciqteujdpgivh3cbnb048/73349471732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=west+facing+site+north+facing+housePDF 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_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 17532 bytes
SHA-256: 02449a4a2cb64a8ae68c1c259c32cbeb9d9791bf18fe9b4a381446f3a33418c6
font_02_sfnt_off000131d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D6 10664 bytes
SHA-256: 113a373f0c24f2ad9439ba616d145019070a9110757a2cdef502e2d1c8d2c67b