Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a96d5b20a8caca…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 08:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9e53b989ccc8c22ad710508f32b88c0 SHA-1: 99e8a90ce8c60e403d37318aa2dd771c5cbc9824 SHA-256: e5a96d5b20a8cacab63cc2fc1466f75737938299ccca05c3722aca85b34d7609
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=8+stone+12+in+pounds PDF link annotation
    • https://perfecthospital.net/FCKeditor/file/79334758075.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b48cd2b3---61119111555.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0nsab25cp57k968uube1nsve11/96196442345.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/99252198761.pdfIn PDF document text
    • http://52963566.com/upload/file/202108062121076718.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4c8f265b---viguroxig.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/18506205179.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5dec198e6---66445945214.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4149883673---binot.pdfIn PDF document text
    • https://hiroyoung.com/data/files/tapodaredobogudukoranat.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/09b4c51a135241894f2d510bcdeac78a/rigetep.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0627d9c588d161878969d4618cf625a7/1204343235.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0715f3c2c---tizumexopuniridutuv.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/62478641134.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/mujosa.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0916d1f207b2d51f0915370f55edbbf4/62940692665.pdfIn PDF document text
    • http://atrsara.ir/resource/files/47943969567.pdfIn PDF document text
    • http://otczenacts.com/media/files/wikavex.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/wuzigojijufaxomevimogos.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ee6f9f794a847a0cfb8ec7be2b725c5f/65830015269.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/af4deff531d29500b279f4f92b56dd86/xeliwadagavedekutoro.pdfIn PDF document text
    • https://ikansambel.com/contents//files/12861435237.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/noleb.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/83b2d8b45cfde3c0bedf92dc89a9b62d/9547110755.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa3a1316e---fimiguvinil.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630473202vesot.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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 10460 bytes
SHA-256: e1afa497a81120dd3ff03a3393d1f0aa8addd61f326f6cabe0d5d0817fccd7cc
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 17648 bytes
SHA-256: a35ad0655d2e36b070ee68c13855b253cbe17940246074c34719efffb8be6165
font_02_sfnt_off00011a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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