Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad526934112d11e3…

MALICIOUS

PDF

150.8 KB Created: 2021-06-26 20:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6070340ebd6073494aaaf2184a2982d0 SHA-1: 6707f38b59b5b7ccfe8f02a2931a1db622be0bbf SHA-256: ad526934112d11e35f53aa0aeacb9e8df8cc23aac2ead6e8d21063678e34b27e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL targets are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077420707835---68824346658.pdf
    • https://ancoraeducacion.com/images/xenanole.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d6c17da7---33863558059.pdf
    • http://cnzgks.com/userfiles/file///10783890585.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9960ed20982f0f308237f03eab57f56f/katalebowofutalatutejamuk.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa089324bad---13806935316.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e9f48e2bb35ac5d5fede0f6e05f1c8b4/23881238112.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51f62e627---fibibokugazen.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cg4eiq1vu3ldrms6059bope1k1/bebavikufigixikinabida.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/85b18e4c0af6e61b16c9646450d862ab/34402344711.pdf
    • http://provia-events.de/pics/fotos/1/file/kirejagif.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ac973789---82744940958.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ec9b2f9d---75180754707.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/mshp4pi6le31r0601v0do87i63/57363763974.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c5a8885d5b---morusabozozebeve.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/f2bq4nsspankickc6vq1tgtvq5/79560711999.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971131529f2---luxawebakegotuxilo.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081da8d58b92---64200038493.pdf
    • http://atdawnwelift.com/userfiles/file/bojuluxisuvitezepisekiru.pdf
    • http://www.irrv.org/uploads/files/xovefukogirikakikibewu.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97633173613.pdf
    • http://vce34.ru/attachments/file/safenane.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088d05e9e3da---3634152036.pdf
    • https://ludifrance.fr/userfiles/file/nuluxasurepepadeg.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033eeb9c99---94220945219.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pip+joint+of+thumb
    • 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_off0001ed5a.bin
f49c3174944eb02fb855309016b01843b0a858cd559f33ca96593a2cabfd278f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED5A 10388 bytes
font_01_sfnt_off0002044e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2044E 16792 bytes
font_02_sfnt_off00021c60.bin
9560807940852afd32f1135ffb2791ae1eb42bcd3bde858b060a11f27b158556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21C60 18392 bytes

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