Malicious PDF — malware analysis report

Static analysis result for SHA-256 d783cc3235044c04…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 23:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cb8e1c3b08a5f2c54314675138961d6 SHA-1: 03755da6dec5446b3b83f26fc2489f2d837cb702 SHA-256: d783cc3235044c04ea65e4d050cb34101bbbd471da6eb86ba27fae52e5202bc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://selfmadefilms.nl/userfiles/files/semenurerepafesiwamuvuwod.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76c67e615---xolawefolefo.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c465ac4f50---mixagutikala.pdf
    • https://bcbc3399.com/upload/files/giwinodiwulunejutorime.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9246458dc---54568418845.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16079de4ae057f---456110743.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16c669118---dinivozojot.pdf
    • http://learnersdigest.org/userfiles/file/rirududifezikobuxalaz.pdf
    • http://fixafilm.se/userfiles/file/tisawakabanitufasunalufa.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a6f73e42---supudebexevodavet.pdf
    • http://nousgarage.com/userfiles/file/junovogifipuzogunezobo.pdf
    • http://www.biotanika.pl/upload/file/51296198194.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d48e2d0ca8487ba861cd526051e18a5/68095450934.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7d479786---voweru.pdf
    • https://abugfreemind.com/userfiles/file/97296560320.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1e4083bcb875435505805ce7ee5123e6/85261818866.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/t99e5dmiealqfn8qmc208453if/72619409492.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae1b7a67b---16303293937.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/377d7a837c1b4a3898ab7ad6091b3a1c/42189781147.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960a7719d7a---65623019871.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/81f76e58ba2b8b86b6ccce88504b2b01/tifozuxekupabojafo.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/62b182a350531743fc67d078bec8767b/10561008527.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609616e30cc6b---sekidawilumep.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=reading+comprehension+simple+present+routines
    • 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_off0000e696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 16792 bytes
font_01_sfnt_off0000fead.bin
294ed39062a25f9058d0d92b1f2e2e29204f93f44f83932a5087bec0990d0291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 11104 bytes
font_02_sfnt_off0001181d.bin
edac355474f2812456918b6c27beeb88fa5ef1638e7ca78fa80d320b20fd9d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 17572 bytes

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