Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c95f3e8183a2ab…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 05:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d2fd57ee42fe396e84dde2f6039cc22 SHA-1: abaae3c7326b8e22637ac683084b0cbfbd9d462b SHA-256: 59c95f3e8183a2ab427f0ca1393ef31df49814a120cc87b0f04d3a290659d9bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's file upload directory. These links are designed to host and distribute further malicious PDF files, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://blissrenewbeauty.com/newerac2c/userfiles/file/jatiluzasigun.pdf
    • http://banner-ever.com/ckImg/files/miwupaziruzomafuledi.pdf
    • http://kashima.cc/userfiles/file/ligibazav.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9542043a6---88527480556.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250c61711d4---11390411867.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d7bed5a7---lilukuwudololo.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5f689427f---gidifenasukaginafotadok.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gmfnk7rblj5uu7l55pqcarniqa/kiwulozala.pdf
    • http://pgnsualumni.com/clients/872691/File/xixidesaludafumu.pdf
    • https://menu2uplus.com/images/file/gekeginupig.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/v65h3temd8qg3u0msqj7m6ufil/kijok.pdf
    • https://torbay.ru/images/uploads/file/fojavanunegobuzevawodij.pdf
    • http://protok.pro/upload/files/26592002964.pdf
    • http://alhouti.com/userfiles/file/nogakepovuxemakegelu.pdf
    • https://argumentua.com/i/file/gamenomivizozokifofudu.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/78414340895.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37cc924da7---30195116436.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501182901381720.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/80518701195.pdf
    • http://thepducphat.com/upload/files/koxarepigobolugu.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548831f816---5495454014.pdf
    • http://fbrasil.com/userfiles/file///waxij.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607563d1147b2---31104406965.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mastertech+washing+machine+manual
    • 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_off0000de6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 16792 bytes
font_01_sfnt_off0000f681.bin
935537c2dec5489bed29b992f70a9b94ec7d61649c1d349a246d50b372d5fdb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17956 bytes
font_02_sfnt_off0001242c.bin
446badb3a5134bb2dad16d4d3332763d61816535874b7d6814473d6982b8d3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10736 bytes