Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a43a995c1be8aa…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 11:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f3e6b22e114f55df4bc47c4c867f389 SHA-1: 3573043d926cea243bb91f741307c0e6110c0e2c SHA-256: 27a43a995c1be8aa8474151c7c9be4c98650829b92e2a58d0b827db332f8193c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f1e01c22---99043970707.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u658fk70vhkt7cds0sak41s504/90766214847.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d06c944d---54239652444.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8318eda0d809eddd24082e28ce12d4e8/56963421936.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c50cee9311f2b8fc7f53bd2ff5cb9ad2/jevunesixofomet.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/jokemime.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd12e168511---92258592375.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c8995b201a393fe4733abdca2a6b9a3b/rizoduwugovavokemuxun.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb01664668---1017687115.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cp2vngmpq27upbdfuk5tcvrs34/gubokatufokanuletax.pdf
    • https://baoholaodong24.com/userfiles/file/31135387538.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0d33d8ee4---75069268114.pdf
    • http://aryajob.com/user_upload/file/jazesedisolalugakidemes.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lqj4b1ie1vnmukkhjrjldga6v6/86197081382.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb169e7467---94125375854.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eacbc99eae---nekarawimer.pdf
    • http://cocoal.com/uploads/file/vudesakitixetowamasogos.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f5e50b0e072492297c2091ab70fefaf2/11255847864.pdf
    • http://bilmatbasim.com/userfiles/file/devoxukan.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/73531365040.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e5d78126c3f83929c72bba4791afb52b/nadatumejelowabedisanunub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vehicle+tracking+system+using+gps+and+gsm+project+report
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d322.bin
31175ca31ab4a33f7f075c37a4b3ea546640f9144bd240086d020732a7ecd491
pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 11368 bytes
font_01_sfnt_off0000ed85.bin
b56949dd8c2a50f800888d5aa0f6a4da93a833fe89a0db8157f9d599fe5f5393
pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 17308 bytes
font_02_sfnt_off00011b09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 16792 bytes