Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f33347880faf845…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 19:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a513334e3c7130346050f0e76ab3bd4 SHA-1: 7cb81f76a889859aead2e7ff172d75d3d80aed5b SHA-256: 4f33347880faf8455aee039833b32ddb71f714d6e4e62ab5b49c2902f73aa047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to direct users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://huntic.ru/uplcv?utm_term=mortal+kombat+11+free+download+torrent PDF link annotation
    • http://tokstar.com/_UploadFile/Images/file/32660131633.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vakimob.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/jigojilezineku.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136615f6e52d---48238820251.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/bezos.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/vufodowepolazilowavi.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/folejofur.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/vefozopafumupud.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/nonotilus.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/18639808684.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090508528672.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615165a93f506---1432770835.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/putevizexijotaf.pdfIn PDF document text
    • http://surausa.com/uploads/files/majatuset.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/6475746205.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210920032300010998exz5ppvu2ovt.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/19807395545.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/26291001269.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/00de4b4389abdaea8c8b714dccd39a61/47734706249.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/33529973984.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/35640200862.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/95420464992.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/pulot.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/56700868232.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/taxawoguxex.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_off0000aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 14988 bytes
SHA-256: d212196de034d9927466b688183d4494ee5e1b7bb2bbf36ee8081384b9463a99
font_01_sfnt_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 10616 bytes
SHA-256: 94407ba964e552510234fadefd04ec533356bff7612444313b311621e8da08a8

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