Malicious PDF — malware analysis report

Static analysis result for SHA-256 995a24f78768baff…

MALICIOUS

PDF

68.8 KB Created: 2021-09-13 03:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dedc6d0487e4ccedccecd4db6d4d511 SHA-1: a96eb9c9966d8822871163899f0bb0ff729556e2 SHA-256: 995a24f78768baff4ed66444c2ed5771749051f324f10b83ae3b5e7886c73c1d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents a full-page screenshot to hide a clickable element, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ninda.vn/userfiles/files/siwonubab.pdf In PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/dibawobemusatunexode.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/bikukufalotaru.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16135427220677---11839746887.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d9658665a28e5a0b2f86110b92d8ead1/58946901148.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/papefivemaw.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/jadeliravadal.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/76051242674.pdfIn PDF document text
    • https://iwistw.com/upload/files/49737992451.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/99014805356.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/binuzekodajadedal.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fubetes.pdfIn PDF document text
    • http://imaginove.eu/data/Files/tijuxugoxojiseguk.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-5/20210905150018869275.pdfIn PDF document text
    • https://tekartltd.com/upload/files/duzod.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/bukotogix.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o6c8d0bbqc1pob5lqjtgf5t5nm/zawepad.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/4513418113.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/riruvinejojaw.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/10152793371.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/jovikenumagago.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/27987060691.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/62807722348.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pepitadetuvujupexovewoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=critically+evaluate+the+following+text+and+answer+the+question+given+at+the+endPDF 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_off0000af31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 13712 bytes
SHA-256: 788145cbce2cf312e5597b98fd2ad29080860b8c16123ecbba6883ff84fe7401
font_01_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 11400 bytes
SHA-256: 7fd216ac7352fc5144a8b1ea5fb502f600f0be4675006723a145271d5039ac72

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