Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aaeb8fdb06bc1e5…

MALICIOUS

PDF

103.9 KB Created: 2021-07-01 20:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 695a61ee0bc57d201dc63453d8728ed0 SHA-1: 6761baf56cad83f3eedd70b253b9848b1ac3c066 SHA-256: 7aaeb8fdb06bc1e55f33580c28709423ca3f0c5b7567c9db8329d5d695a39653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself are indicative of attempts to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/vb6u71uaqnptlissrqhd0sd2kq/30817935010.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b709aaa669---55539225001.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a731f285fa2---41529316688.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/eks47j2hihsrht3vklgd6cofk7/39991239456.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tn6gk5j7ngn6v522asakeps6c7/masusavarexiwezarefosewe.pdf
    • http://liburnia.pl/userfiles/file/buvufukazidalopeg.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882fc11b776---78904253273.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7990d03003---sikalije.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0cb4f18a52a9c03e2ff32ffa6a0d6014/50833979795.pdf
    • http://esoftland.com/userfiles/file/monunuxotulika.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ld9vlv1iokl0knv9s3b85l62g1/liwagubiwok.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1efcf6586b8120f4dae6662aaa5537d7/xufaketusinif.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a3ba6d9c1e74700aac521c64dc96d018/poxagupujulajelejuk.pdf
    • http://karat-dobremiasto.pl/userfiles/file/17669271849.pdf
    • http://utuin.net/files/fckeditor/file/17837961618.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/pilanafito.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/rumadi.pdf
    • http://womenscouncildallasarboretum.org/clients/85748/File/weduzanadu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a379470203---12834815541.pdf
    • http://hotelbelleepoque.bg/userfiles/file/29999550421.pdf
    • http://classofjoy.com/KK/userfiles/files/xalexogewodawoto.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083a687698c4---doxolako.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2a797198---wovikojujopufezuki.pdf
    • https://autotrans911.com/thread/admin/uploads/file/1801470437.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a951fe03207---kuvuxexuruzomif.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dcgcflikb3tmu72mda40k7p087/88001303406.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fishbein+and+ajzen+1975+theory+of+reasoned+action+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123b3.bin
b1aa58962a93ec70dadc8191bd750d080ba1d74dfb8f3b0ec14320ea4aff4a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 11496 bytes
font_01_sfnt_off00013ecd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECD 16792 bytes
font_02_sfnt_off000156da.bin
17ef040ba3acfaaa2c1de0545628a8c39e467c8574fc3f03ab2c278d405e2727
pdf-font-stream PDF embedded font (sfnt) at offset 0x156DA 2252 bytes
font_03_sfnt_off000160f0.bin
a2a05bb23813f0b89f75a13fea92f2865800ce1d7770005b1604e0c7b57e2803
pdf-font-stream PDF embedded font (sfnt) at offset 0x160F0 18136 bytes