Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1bc6a36471f74d…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 15:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52bd183250994182b294f0dc3273a86c SHA-1: bb7ac64136d3fa51909ec03d2885fca31e62fff1 SHA-256: 8c1bc6a36471f74d8c414908df59883a3ecfbbfa36503f57502ca88e1344f79d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of multiple links and the nature of the hosting suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://df-foundry.net/d/files/2475467775.pdf
    • http://tfh-filter.hu/_user/file/82229678693.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c75c873d811---vonebajinasimuf.pdf
    • http://veraschwemmle.de/fckdata/file/76515964079.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/55c347987e342222dc31371f15d5941e/58475623492.pdf
    • http://amandamaitland.com/images/file/kepul.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i6tosl8h3nj4deri7ctbvj4k6d/pawuvuvuzek.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3qh5a5fjp65hvcofasjm98me41/79656307447.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e65d21fb85594cf62ccb545628e6bbae/sidamezabufipi.pdf
    • http://standardamulet.com/files/files/8917878546.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/folurakabegogajesem.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b3adce04d---gugerawe.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e0d71231f90cc3080be8b8205bb8458c/54125857867.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c909d1bf96f---zipuloze.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085add75a6c7---konatitaxidimulavovimusil.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdba371c5ee---12612775714.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160828a7cdf7fd---xaliwudunutigenowewob.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771953750b2---zipamomabiwemalujunotewa.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb043bc241---juxobovurifukenag.pdf
    • https://betenenergy.com/sites/default/files/file/gubotefenubom.pdf
    • http://airconbank.com/upload/fckeditor/file/37193091514.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/amaihf8taiqbi077aupgte5ak0/66284246693.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609643bdc298e---gelezopu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1e687289---29256818817.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=funny+quotes+for+high+school+students
    • 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_off0000ead0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 16792 bytes
font_01_sfnt_off000102e2.bin
a8a5dc61251b827dec147bd43a0605068b46db8e114e6c117da29c6866c6f7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 16520 bytes
font_02_sfnt_off00012de2.bin
4ab566a31d4dd01b5cc3429ace11a3d7e3adabd310f6ae9725ac83e674ce1429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 10928 bytes

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