Malicious PDF — malware analysis report

Static analysis result for SHA-256 1521b340a37fc82e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-10 04:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f11826fca93fd9fa693956b342fe04c2 SHA-1: 6ef0fc4c9c9dd17f5b8d0db92a43a6ca1d9a9f8e SHA-256: 1521b340a37fc82eb482ffe441e1ff57134ac75a5f1f5c92ee13439bb7abb846
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://tunglamgarden.com/images/fck/file/70300279737.pdf
    • http://crmloccitanecr.com/campannas/file/31879230533.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6376fff8---77209022589.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/widoxaxopezili.pdf
    • http://pijntherapie.be/uploads/files/zufuxixov.pdf
    • http://sportsgarten.com/editorData/file/jenopuwi.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5b3b8d98---puzemadidazoluron.pdf
    • http://pronobile.de/catalog/file/91665546155.pdf
    • http://alexlunacoach.com/img/editor/file/19271053933.pdf
    • https://ayurmitra.com/files/file/wajebasesegovef.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b24a69343---99082215927.pdf
    • http://phongthuyphatloc.com/luutru/files/zowebogafoxixuwewibut.pdf
    • http://nuovojob.com/userfiles/files/vulasol.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49b55672---mobagarasunozi.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a109025b834---kikijitazipojabuvedumud.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f528f2ca---kexejusevunego.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210718_BC1B91974F5EDA82.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/30c9621a0daba95d1e47ab856a113bc6/20294534250.pdf
    • https://cincia.ro/ckfinder/userfiles/files/33889006316.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f605fe5869d---foguwovepofojowixe.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0ac81945---retevu.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7bfcqq70ibu52e508of743qfq3/24328538833.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608293dd5ce93---67533077330.pdf
    • http://xsteelstock.com/d/files/buruxubujajatuzotu.pdf
    • http://spreewaldatelier.de/img/editor/file/zegukason.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5456e55b28---99782952769.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ecuaciones+diferenciales+homogeneas+ejercicios+resueltos+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_off0000d6a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 16792 bytes
font_01_sfnt_off0000eeb7.bin
30365631e45abf09822367f3bb201c06a34ce82dcc9902729acaff05859f045d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 11280 bytes
font_02_sfnt_off000108ba.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16088 bytes
font_03_sfnt_off00011deb.bin
b468c6a274d38a21dd1f068bf902fd469c9f34ae91aba568f0c29f49c9899644
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 17748 bytes