Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c08a8cf25592221…

MALICIOUS

PDF

85.8 KB Created: 2021-07-22 01:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85fc51f2cab161ae1b7354788c08add9 SHA-1: 3d956886689f477f9c6c1f4fff2050ccd7c27922 SHA-256: 7c08a8cf2559222114afc1ec28a69907bc64554242c8f3f1bee60481762460dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified multiple external URIs and a link farm pointing to potentially compromised WordPress sites and an IP address, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous suspicious URLs strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://soechi.id/userfiles/file/7692855612.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098803c294e0---45550113423.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0690961561104b4e655a789aac43cbba/45007776126.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/73232714944.pdfPDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r25o9d6aam0jnuth8fgdita1g3/85896478962.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9aed356c3---zixubijimovugulawisimimef.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ad210c25693b01d1b7b3b33b7f208225/84209636071.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6642a5e8584ffd7ce7c3920cf3a8da36/datulijuboxexerove.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f5abf0deffac63552af9db07bfc6265d/54375223103.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/91272211676.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/gilamazuse.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/kozofupelojijev.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a978afaba---83124885722.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/52361323855.pdfIn PDF document text
    • http://zae.me/datafiles/file/jobikizotax.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/45715528670.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/nezojonowig.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b66574f49---fakodabivuvutugimepewu.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/29249144307.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e89bbedb011b6ced8ae31a56cf3731de/dibamamewobovekorunapa.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/jovenowevakidifagigodaw.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7l0nodr3a2vsdcat3s1in0l4lu/tikuv.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5b6vqmit56pf55u1b2e3sktlsg/11465588756.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/10464465162.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/53553380377.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fe2fe344b---malusirikavomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+mouse+the+frog+and+the+little+red+henPDF 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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 17640 bytes
SHA-256: aa3196c927d7d18a6add6779ca817c73968f5881b9b0b36f9e2724e7b13fe00c
font_01_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 10864 bytes
SHA-256: 175a834368a166bd71e8da0f75acca8ce69c11c55af4388881ea20bcdbb6dbd3
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1