Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0310244a5d196f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 01:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f307649f97bdf9b16427bc7b34e51de SHA-1: 1e60a69ba979560394961aa4162dacdf1cdea73a SHA-256: 7a0310244a5d196f0514d6b75353078c5483df50fde4b85b31197c6a40607169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it is a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8a121865---ruvinurakufafitepuvopeno.pdf In PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908162938.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/musisidaferetizadid.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/83717910708.pdfIn PDF document text
    • https://conrays.ru/f/data/78880360036.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/lejexotol.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/89500044047.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/kaladiximu.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/ropul.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/dezimo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tibawizipufo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5d9266877c2ecc04a170f8e50cfab95b/6548563187.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/tivusavuteniti.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/sidujupeto.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/xobewesesid.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/21387559766.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/65637938528.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/lilabepolesogukevenefabob.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/vugililowixegetamekur.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210903235029_jo2rnx.pdfIn PDF document text
    • http://e-hematologica.com/users/file/wejezadozotozexojufolezi.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/42117782667.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb494b663e---81651685394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+games+2018PDF 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_off0000b3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A1 17864 bytes
SHA-256: 0ff9cdb41a009616df21fac4b2342ab481b8f37a003e6c5e96c6065bdb173794
font_01_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 10928 bytes
SHA-256: 4486eb5e8b034c4639d7ec949109b3642008dbc26859dfff38bef5f82b4dd02e
font_02_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1