Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f06f7d4d874cba…

MALICIOUS

PDF

80.4 KB Created: 2021-08-15 06:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1856b78d8529665bff7c0ab38083b9ed SHA-1: 08a830fa1acb4ec5a533487d660dbf36a4bda160 SHA-256: a8f06f7d4d874cba5ec93017fe016759bc69b7816aadef8e53e9dc3172d3fe41
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://alexdisinfestazioni.com/userfiles/files/1266622679.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c59d55e9e---kapibevesipagudidevufa.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/3509693108.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/caba276754fd9237dba594f96a2caa1b/pimuw.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/50895926896.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9181d963ccbbc814e66e71034fa2ef48/93634498768.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/xuzaleguluvizosabofof.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16c619109---36152222554.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/632c5ce8033fdcda640871706e7074ac/zavat.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607182cea30b4---32069091113.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/33788580588.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xugujogowodebir.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/buzoj.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8ts53t42137401d20u0dk4p7m4/1672061321.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/47042540865.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/96f41a07a616cd889b6018d62bf1e9c9/seveno.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/pumopenovelozumamukifuveb.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/28a3b8ec01ed4b51e04897f906938c63/metudarusagofuwugulinov.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/kiwotuluduvasal.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/panizux.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077193e7280b---93731463895.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/najabifuza.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/46266333709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=acido+hipocloroso+estructura+de+lewisPDF link annotation
    • 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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 10672 bytes
SHA-256: 221927c5359ca87d849785d9cb5b3dc085a75d37bbe54deda4ea1e8839e528a1
font_01_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 17120 bytes
SHA-256: d02620e18785e5d35e13fa326aa73403eb91e180ff226ef18913011a87f2ffe6

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