Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fd12a355eda026…

MALICIOUS

PDF

83.6 KB Created: 2021-06-28 15:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 333dd6aac07c1fd9949b6a08c3f05c02 SHA-1: d024132d6d56671eddabdf06a4afa4bb83b6fd57 SHA-256: a0fd12a355eda0268f23fb96ad928f35c5aac827242dbcf5e356f8f4cb31cdab
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://infrive.ru/uplcv?utm_term=let+my+people+go+armstrong
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bda892c98dd2b12827d740542a3e98ac/gijevukosa.pdf
    • https://hizlipin.com/calisma2/files/uploads/93460580857.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba3ca4abf---54064926532.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/fajidinevidopogiwoxuvoj.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/645e9bcdf98305d72755640e4b097aac/furojufozoruxomeku.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16207519136729.pdf
    • http://epsilonsigorta.com/files/watigo.pdf
    • http://ledins.lv/cms/file/94215725784.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/096a8140f8b2894fde9f895d78fa10fc/78509565231.pdf
    • http://tunglamgarden.com/images/fck/file/2971983985.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/81677baf0262844df5d0e4c6fd73456f/merilepapizuzitebomolegot.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/06d1c035cb10d325a140138464b16a11/69775856016.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38a2845af---72088692474.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1a8682ed849df615153b47b24704e21b/foxefesunuxikupixu.pdf
    • http://ttccid.com/userfiles/files/2218397253.pdf
    • http://mispuntossaga.com/campannas/file/mifusexivowidobeme.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda75a89ae---boviginoludafeton.pdf
    • http://boothbayharborshipyard.com/userfiles/file/vawezozorokoroj.pdf
    • https://golf-tout-terrain.com/publish/page/file/74333017888.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u2mn5htcaarm3nt10g7cpip4lc/88578037176.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ig5rf7aoscg42dln6gbb0433sm/29753544596.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fef145cd6b48b957e3935fdc37181ea2/36617218147.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c0807295---12912874783.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d75d092d86---fubekakovilafoti.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e78fe947f---famowegesiko.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1c.bin
215e97fdc0eb85f487237e31c52fcdbf9b6a0f77029523326633b6302a86e363		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 17972 bytes
font_01_sfnt_off0000f92f.bin
56b8817ef081d0ebf6d00dd05a4cdd47116f63c3896d064c23886b424e9f8825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10572 bytes
font_02_sfnt_off0001114f.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 16160 bytes
font_03_sfnt_off000126c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 16792 bytes

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