Malicious PDF — malware analysis report

Static analysis result for SHA-256 1388515c5b13d7ef…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 02:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d089e6fad6ee4b24cb503e5e086b36e SHA-1: d2fb53a646c57bddf86951458cc7ed7c17761516 SHA-256: 1388515c5b13d7eff4a52c7adfaca3af5a700fcbe92cd33ebe516214db5b52b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3bf17ef1---wujitamodojukuzere.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4406e04e96---bawunuwomugaloveso.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4b8c66516c8729c9ff69908a9452ab54/88525812212.pdf
    • http://thesetnews.com/images/fckeditor/file/suzezevetomob.pdf
    • https://angelsstaff.com/uploads/file/58433846001.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d54acfada2b---vavetafifemenez.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q7oap19cqk1h7qu731tl6tl153/susudibepiwaregutukowod.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da5971de66d---pivasepuxofokujuj.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea0003331---99003928830.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/49936182316.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095b71c99043---3514572390.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098917174b91---66652989123.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e11d18df38aaf7100d9e8729726c45a5/15344110828.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b47cbc3e2---tikebuxabotexozabejafe.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f070c588fd---83717483828.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0461cc6b---gizarerepikawegiga.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/nixezezipagavajefija.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnfe8e562hbsrscg265sjpdalv/82588744888.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f2f13ca1007eadab3bace11a61bd827e/vavinixozamisepefojugo.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089fdf63df80---95380233949.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f78108bb5118e593a057e860e690c1c8/vefij.pdf
    • https://harrisitalia.it/uploads/file/nidiwibo.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/eb7e0oc1thadjbmg3ejodmjnb9/38508522048.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=why+do+u+leave+your+current+job
    • 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_off0000ed09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 16792 bytes
font_01_sfnt_off00010520.bin
61ccf6252a1c72683cd737a597c5c8c67bdb99941d83a780933bdd2370d8d4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 10752 bytes
font_02_sfnt_off00011ddc.bin
b8ca681a5e93986db595055c74b091fd57abd526b0ab545eaa1b1fc0bc26e625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 17340 bytes

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