Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcc29eebddd7327…

MALICIOUS

PDF

75.4 KB Created: 2021-08-22 05:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 803aefe6357555b6b0fe814528edd4b5 SHA-1: ba650d0f9b80e7ecaa55b06f08e9070affaa0ac1 SHA-256: ddcc29eebddd7327b058905a37a0a1cd643a6a1f9196facae98995ba71f3b848
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=amoeba+sisters+diffusion+worksheet+answers', likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://queure.ru/uplcv?utm_term=amoeba+sisters+diffusion+worksheet+answers PDF link annotation
    • http://elsekmont.eu/userfiles/file/sevizinekekexisuxelefat.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dbce8814---77205906407.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/zokutepikagami.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/71763507904.pdfIn PDF document text
    • https://85097781.com/upload/files/buvosikor.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/61986633096.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/xatiwasafumibula.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/597820a51fe2add3a45177595ba906c4/kibokibirufowin.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/99445151202.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/iqrj56pofpju804uiqo7cu6vf6/rewilabarogusebe.pdfIn PDF document text
    • http://iphysiology.ru/upload/tefawuzoda.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16104d132e144e---malisofolaxokamimir.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/61385327853.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/90030366547.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/sabigix.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ae8f06e3f---pibefemovatole.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/1ojdgkb8rh9ira6r7jgeddcd0r/55052820016.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zomadeninexokotadefikowi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2ac6919c56d5a39f2e418eef7402e148/kolonizelaxadis.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607868c08e49e---pagelemu.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/jedemavavotavopumazixob.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083483de94ed---54166041742.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/zomet.pdfIn PDF document text
    • https://zold-kommando.hu/files/8817752997.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/wovobukor.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/40503405460dde802bb70b.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38E 10972 bytes
SHA-256: d2cca2276c02de5610f8bbb1d82e5cfd38af40e5f3f569a724822207f8754f59
font_01_sfnt_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 16208 bytes
SHA-256: ea99b44e7b74e5bb7760ec0d4679dcda587640048f8b54c1de81c5e96a2ee811
font_02_sfnt_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1