Malicious PDF — malware analysis report

Static analysis result for SHA-256 c311efa33029812e…

MALICIOUS

PDF

94.4 KB Created: 2021-06-27 06:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e19104ec28c43e852f64fcce5728b88 SHA-1: 6611a996663df5ffd56f09e74a5b9accf4a11b5a SHA-256: c311efa33029812ec34d9bc6a469017a9c34c8f9d1877aa8a354a9e61fa6265b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This 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 links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to phishing or malware distribution sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://allytemp.ru/uplcv?utm_term=aircraft+mechanic+interview+questions+and+answers
    • http://absolutelyneon.com/userfiles/file/28650216396.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4e6ae2f273f406851f9f28c13a44b557/22872257913.pdf
    • https://bandotrading.com/uploads/file/tukepisuxaluvetirexe.pdf
    • https://parc-hotel.info/file/4419079128.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa554e1e93f---7372768449.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97d329333---fawinisazaxumizep.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/314a95d3ecc796b58d11f7cd1636dde3/13323045687.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/44268614569.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cf4bfb058a9e7fb40f6671a6dd636d37/pubewajawonisa.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/85498d8d1113c698b1603f4c2e7ca0ef/subepivexutiletom.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/gvkpda0h452i7aqvkf8s1ktj06/80341859796.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebb777fad---kufijej.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e203914417---ferojuvugimop.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160838b0811f3a---39032532725.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/90737416992.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddbc2e383---66024811134.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa345f463e9---89715152860.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483ff0b697---fegilegilinope.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073726f6622e---relodulagure.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5815b8889e5f2cc3b773de110c647a0b/94860557993.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f77b3a566d7e6cb4fb0bf51bc1ef65ba/51262778962.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ab429434c3fe3804379fc523a0a4aae7/30033565116.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13834bcba---radebusamunu.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfd8adf8c6e5f09bc7bba31a0b473642/68277487266.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 16792 bytes
font_01_sfnt_off000123a7.bin
827758d34d57e4012db9ccd59d5e9fff1624c91c177f5e02359de93b57f839c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 11076 bytes
font_02_sfnt_off00013d2d.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2D 17636 bytes