Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19ab441c9b8de0f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 08:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13da3d1829f073ccdf237754d4123b9e SHA-1: bb9c22d2b78ed9e08a85bd621e6c5885e20a8d3d SHA-256: d19ab441c9b8de0fe10e78df25b47d4d07e8a636f8cbb80b3f063bfa20109366
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

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 https://synerhu.ru/uplcv?utm_term=multiplication+and+division+of+fractions+worksheets+with+answers+pdf PDF link annotation
    • http://manhchenang.vn/webroot/img/files/pazika.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3epav05ihjhlnegnes3k7gtnmb/walivebamumezazuneked.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/la2occohmuk09fmbr4ra7ouh1h/vudasuf.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/20018377596.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f43aac54c47---78413516857.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/89705af1a165da08785e2bd35f3c9dc7/xeveboradadutegilixozidal.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106060354217780.pdfIn PDF document text
    • http://falerisztika.hu/tmp/rajatusexigigenemo.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wuzenaragovaxozofe.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/pinitoxafodotakewawan.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c269f86f048---72864705310.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/81004580551.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/desonovetidozil.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/sadiwogudadizugetubixuror.pdfIn PDF document text
    • https://protum.se/file/40603232054.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/86060809374.pdfIn PDF document text
    • http://haphadoor.com/upload/files/11303024554.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/76770051934.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ebab9866838505f77c218881742c0ece/pujifurama.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0514502001621526495.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/53233096911.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9f6d5506---pozaniratuveginevope.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/getorididepij.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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 14968 bytes
SHA-256: d3a5d6840cea4e725d3cc7c4ab960fae83c548e4adf54097bb853cb935670001
font_01_sfnt_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 11052 bytes
SHA-256: 9ec762f8e033742e8f219b724f9be4d49cacd48d71081ac2ebe7f851559fe056

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