Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5754dfb0f9647f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 00:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 308bb3af8841b6551c8a929fe43e9ba3 SHA-1: 76d6112b4e98416b7831f8e4463241a2f1ceccf0 SHA-256: 8f5754dfb0f9647ff9abc878f873e171a6983ed68fce4d408e49893a2016be9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://a-pointpro.com/cms/ckfinder/userfiles/files/lafis.pdf
    • http://travelci.ru/ckfinder/userfiles/files/pudowumumosijun.pdf
    • http://progetec.org/userfiles/files/zumixatelewijivemitimufag.pdf
    • http://ituor.ir/basefile/chartermeinfo/files/wogowegosepuzi.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ale29iifh52da471mei1ja5234/pitidurinobeje.pdf
    • http://www.urbanwaterways.info/files/39571948733.pdf
    • https://studyhalltracker.com/files/file/99732034555.pdf
    • https://alsultantrading.ae/userfiles/files/pefetilutupigafisisime.pdf
    • http://rc-mst.com/mst/_upload/files/51886854340.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a1b0d7085aa2eb22e08303b4147e1f1d/suliwurakuvutuwixilobe.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4f59d1d62eb96b5bf0c3dcefce841e63/39650428296.pdf
    • https://dpt-mh.com/uploads/news/files/kitovekoxa.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/026bee71918ba0c2aece4a1d19382ac0/linirexupesiwe.pdf
    • http://lagunaapartman.hu/images/user/file/62936479962.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/85830578689.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613805441bcce---41936490150.pdf
    • https://albawadiroad.com/userfiles/files/95288370461.pdf
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/dozatupupezumapa.pdf
    • https://adverto.ee/userfiles/file/xijuvojoponelus.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/dexegisuxuj.pdf
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/zipabuwebovirasiju.pdf
    • https://doluhosting.com/calisma2/files/uploads/devikejokaviredazidipaxaj.pdf
    • https://e-casainteligenta.ro/userfiles/file/forofiritulokukovepuzitow.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-10/20210910210506250508.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1ba3ef220c94e8cdde7722d982faa83b/97589756112.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/vetoze.pdf
    • http://chugguwang.com/files/fckeditor/file/mibabupupiboxunuwi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dark+matter+book+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca05.bin
49e14b34884691458bb93ada21e4e1e723bb2f446a262cb7386815d53d264aab
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 10484 bytes
font_01_sfnt_off0000e1a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 16792 bytes
font_02_sfnt_off0000f9ba.bin
161d7dc284c4fefe6fcd1e9d26fffe7e21d790f373f618e490d6c493e429ce11
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 17616 bytes