Malicious PDF — malware analysis report

Static analysis result for SHA-256 d464d3e5239926d1…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 09:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecfa4e763423d394b4d0aa372bc0a35f SHA-1: 416b4711711b724d29d4e8bd758d4947c2b271d6 SHA-256: d464d3e5239926d1ebef246ba9293bd63e891f2f48f163ba36cc098c403f1e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to facilitate phishing attacks or distribute further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5ed76c93---nowipitageturuvajisivus.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/wipiwenokogipirilibegan.pdf
    • https://sonarmusic.hu/up_image/file/bidususis.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d490cbbb---27660107919.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/00ed474a9cf6c84ac5ae69c9a5db5a93/75344444645.pdf
    • http://poltinik.ru/userfiles/file/53259286658.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/3769600682.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e875176bd7---wuxobulujoko.pdf
    • https://toppelletmachine.com/d/files/64516697780.pdf
    • http://vivatbacchus.hu/files/file/jupupo.pdf
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/79123051806.pdf
    • https://carlojans.com/cms/file/xomojesakeburojofed.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t9dkdt857k5613fdp2bnhgean2/zulolalododuzozagipogipup.pdf
    • http://v-lukomorie.com/uploader/files/24477291356.pdf
    • https://canionglobal.com/FCKeditor/file/49152892128.pdf
    • https://burstallconrad.com/editor_files/file/76107176796.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab634068196---50364917343.pdf
    • http://zerosquareonline.com/file/bosefinopejopedabetamono.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9m17u1idfp327oqj9tniajis2m/tomegudofelomiminibikun.pdf
    • https://maisonforville.be/documents/file/41575413344.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/22260808800.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071891b0af94---92073073350.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=riced+cauliflower+carb+count
    • 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_off0000f428.bin
59be4abb8f5fd6756a149b1ee250868c2db4baf195942bf337558ea399585958
pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 10672 bytes
font_01_sfnt_off00010cc6.bin
f7fc34b5a34d9fda76c3424940d3c65cfd9f09919bfae653317eaad7f025dff6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 17056 bytes
font_02_sfnt_off0001396d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 16792 bytes