Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc72dc6ee29a759…

MALICIOUS

PDF

152.3 KB Created: 2021-06-25 09:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cdd88de8dccec690147e73e2de6a687 SHA-1: 7304c138a262ca533ae05030746f46038e8df43f SHA-256: fdc72dc6ee29a759d4cde010fb0f20c6560d7bfeb8d248b1d0654921414d423f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The file likely serves as a link farm to distribute phishing lures or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=culture+shock+definition+pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/18954259040ff05c0534bf5700b6d5e5/gegadizupo.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/butanega.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6128778c7---vivojojaporiwuvusosegow.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/776be8d1ddebb5824db72ce18aa1f604/lamibifesi.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071143297ecb---44641662256.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a894bc0855f---5152251405.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/d323a7232d8ac0fdc59b2116cb2924bd/6158831977.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b040da3fb10---nejifin.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160869ea643ecd---pedefo.pdf
    • https://canevastoilestjean.com/upload/editor/file/gesojifutomejip.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/nijumesujugeb.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e41f77ed53b97fc2fc8784b7181482d1/13827934002.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f5c56fdf---zabimikaxa.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b215193d162---63717838616.pdf
    • https://nanyangtextile.com/userfiles/file/mogazodiri.pdf
    • http://busanpc1.com/upload/fckeditor/file/10078460484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0002012a.bin
293d21310fa1ff024f2f0f0ee18ecdce845294d0933db8d4c1bd70709d5238d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2012A 5004 bytes
font_01_sfnt_off00021224.bin
d1efc7fa73b073a6af5cba67c1ef3759e61d130745aca04b47db97eb8be46b38
pdf-font-stream PDF embedded font (sfnt) at offset 0x21224 14708 bytes
font_02_sfnt_off00023d59.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d
pdf-font-stream PDF embedded font (sfnt) at offset 0x23D59 16060 bytes