Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef24a0b86ae97e7…

MALICIOUS

PDF

68.1 KB Created: 2021-09-13 00:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79d727f37c42d6db75f483d5ce99630b SHA-1: c8c4abd064dff0adf65df8f8d7b3f6790af962e1 SHA-256: aef24a0b86ae97e7e93fed6aa8948a3c8bb31facb32f22b9da7e4ad5a88a0616
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. The document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=hisuite+android+download PDF link annotation
    • https://cincia.ro/ckfinder/userfiles/files/jesuworuvomasuwebunesodu.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/fevinoserajif.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d8e5fd4162da1acd12aa46eede3b8cf4/20956115988.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/dizibex.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/kekoj.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/52819889400.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/88757292295.pdfIn PDF document text
    • https://kenadong.com/contents/files/37055055451.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/27711356400.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/sabotaputi.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/20461178508.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cefd55448b2d6c17bcd038fddcd56a6/dosoruw.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/36550830168.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/jijegusubizafes.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b000dc4982---47561142440.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/solexikefudafagosiku.pdfIn PDF document text
    • http://markone-tools.com/upload/files/48807215301.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bf99d62e3b29dd89e9f331f5b2a3afb9/94219574246.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/funazipukaloro.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/bakixitor.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xumenowuzefub.pdfIn PDF document text
    • https://quizai.com/uploads/files/latupafirakiwulaj.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/37659193372.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dopazo.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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 14328 bytes
SHA-256: 0abe231889e95fadda4c2bbd3df3fa82f4baf3ee6e5dfb74c97c33f6fc5fa1e6
font_01_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 10416 bytes
SHA-256: 5a3c8dcc999206ec6dc998c7dc4574614b3f2f506e5a9f9a52ef703f6afa6a24

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