Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bd194009057ec8…

MALICIOUS

PDF

88.6 KB Created: 2021-08-01 14:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bdb716add27160b935ae3a40162fb5fd SHA-1: b74498d555e13aff33a02b7a9dda426807468255 SHA-256: 31bd194009057ec8f8ea2aee2ef7ebbc69ae4fe56ab011f8a095f438cf31d7f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b351de452950a4f2420c55e46d6d1391/81814743083.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/475ee48a72248594e980ef71fdeeb1e2/56811129783.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/585784642e9738fa7bcd7df0ee4274f9/tukutufidipigasales.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a84uftpmvo7mhe3dmj1fee37u2/57789446849.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fdad8a0e2---lolotasowugo.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9c77f019ce2c81626ed0c837702c5a5a/51984909483.pdfIn PDF document text
    • https://susta.vn/userfiles/file/67620602068.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nitetugubibajag.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/922f228ab9cca457e679a34215b61cf8/waxiwoxamibifiromipeza.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/kovarudakes.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/63da93b4f6149b84dda908a61562aa24/virikuxekuroxab.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/tajerujajegudijevozi.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/lifigomuladogoba.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a004ab76e2a---12255040035.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1oh62g7ibgs60v1rks2o8sluqh/budidarewevuwuferenor.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ecqh41c2t2590cqa573hid7m69/93903198936.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6eb7d2f5---momikapujebumolawerojaz.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2f1e39af---vopinubu.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/puwiwibezutaf.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/89586147826.pdfIn PDF document text
    • http://elitvorota.ru/f/file/xematakazed.pdfIn PDF document text
    • http://vkts.se/userfiles/file/79686769514.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9b2c92022---15079859505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=coreldraw+x8+licence+keyPDF 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_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 17612 bytes
SHA-256: 60fed060e445d72f334eeaa134bd6a1b934bcf4c9a7d09012817d349dd50300e
font_01_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 10728 bytes
SHA-256: 089bfcb9dabaa2e608b3c016d5aca4a8646818004fbbdf463f8d7a61e3326afa
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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