Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa3810346bae1a0…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 16:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 587b9ccb2b1baa05d79ff060d4cfe9a3 SHA-1: 0bd4226d076e4f488f6d7b22222c4c1cd3f256ef SHA-256: bfa3810346bae1a000a2d202315eeef5f843d67188b702e30f03cb4a53ee7c79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the linked domains point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://twr1115.net/files/fckeditor/file/kowox.pdf In PDF document text
    • http://hakkabrothers.com/userfiles/file///29909218132.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/675ca8c234a42b0469714ba3a3171ab4/4343469026.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d0mq7s98c91g28vgkt4k3rrf7/51499982880.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sofojewitabogepabu.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/19425175996.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16119d8b695005---12001082164.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210818053820.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6aed0309afb27d278caaefea31a45f4e/71544880351.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/29425688049.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/25230692639.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/nawasalosutejuliviwiten.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/21228584459.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/besunu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mejobepabijejejetanam.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/pisugapijana.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o9t2bhs490al6o71os2va1m9d3/dexabizijisadurepisi.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/fidufutunigezakejarisune.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/76822691867.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/rcqm4f4nud60mevm3ail99tlb6/93265668208.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/numutibe.pdfIn PDF document text
    • https://manenshop.com/upload/files/62673161319.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/81264664641.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/78371658818.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d6ad4227247aebbe3cfd6426b8e7e3bf/kavok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nucleic+acid+lecture+notes+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_off0000c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 10688 bytes
SHA-256: fb83d49d2024e645f6cf004cb0cb9b578fbe26e59d8da810b5719acd842713ba
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 16656 bytes
SHA-256: 3858d2c6f4fe126b5598003661400a411cec4c5d83402e690d3ea4ff99a00a81
font_02_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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