Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f607c4b1d054e6…

MALICIOUS

PDF

123.4 KB Created: 2021-07-04 18:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1751c3da0bdb255b32cafcec816451d5 SHA-1: 615ee7988b9dead08cee5c65802030aa8298d9af SHA-256: 65f607c4b1d054e6a5863a6ade5aef644f353737c8e5b57ec41f879b9771ed98
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the numerous external links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/68mrp0bdi81l4dqt9u3p3qo6l6/zulagodevusenoragepagi.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a7aee743---97515164200.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/da13gqotg2scbelj5k4qbfp3qe/madawon.pdf
    • http://esipro.fr/userfiles/file/7534298492.pdf
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/miligomiv.pdf
    • http://criollo-cocoa.com/userfiles/file/damogatatasaxedudowe.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/91amnacg2mhc1i5le7e0rd5t47/95160919909.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e378381cc4adec95349d7f2e62ff1429/20727470387.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608927151f27b---8342552800.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f541f1ac28---vofulufizuzaveduga.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0ob7j8bvm4ocv6km4fnsoa8in2/43157309591.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084382c0a4ce---83613474251.pdf
    • http://adveotec.com/img/file/gatoxuxoziw.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1i89jb2mlanm0g7appavcbee66/92842448627.pdf
    • http://beijinghuojia.cn/userfiles/file/kaxiwixugewamowegepivuva.pdf
    • http://www.allatpatikapecs.hu/images/file/lalubinupowusoze.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e5488921a---wumipoloxirifafa.pdf
    • https://bostoncake888.com/UserFiles/files/nomokojulagutezugoxejubu.pdf
    • http://rubensova16.cz/files/file/javisusa.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8sra7t5uatrqvobdl3ercsvhq1/24046953305.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcb9de00fb---61036460753.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ipgsc34r7scgem2v66i2pn0sqq/vikumokexuxogelapipedil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=networking+all+in+one+for+dummies+pdf
    • 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_off00017ca3.bin
13c687a4b7c1b1a9dc1245a8086017c18b86fac189ad4380044942748da9ac51
pdf-font-stream PDF embedded font (sfnt) at offset 0x17CA3 19108 bytes
font_01_sfnt_off0001ac6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC6D 16792 bytes
font_02_sfnt_off0001c484.bin
559f093b26f6553774a809e4ee0f81162dd0b34ff95c3ee2316839f38b30678c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C484 11096 bytes