Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1f1130c1f95dcc…

MALICIOUS

PDF

88.7 KB Created: 2021-07-19 19:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8921efd5bc23bf9a9969cdccb1b775eb SHA-1: 1d1f5a8bc22ccdfbacf9a3edd72e1cf40a5528f1 SHA-256: bd1f1130c1f95dcc06014a316c9f609d0679431075f50a2ce3b1a98daf7271b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs points to a common tactic of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://repare-ton-smartphone.com/userfiles/file/28742385611.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c374867fab---dorixisukozolumekorine.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f1c49185982fb36e047196fa28133e1b/86825415039.pdf
    • https://wendi101.com/userfiles/file/dakulemupesebibewuwafusa.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e47296e89---77329854676.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f830730be---fevozes.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7ad0646ca5edfcc0d8dc44f69ffae5d3/lowoj.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160851dc82cfb7---12948875030.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160739bf124dfc---63075693080.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9ea12139128kbfm7juk7rnpd81/83953348773.pdf
    • http://pobierzplik.pl/uploads/files/27297989520.pdf
    • http://uhy-th.com/image/upload/files/1420949245.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609073ef5d31d---73666121244.pdf
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91b33d5f2---4465484040.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0289b75c4661d0aba2b92b76086413d6/47597277629.pdf
    • http://fotossc.pl/_files/file/ruwifiwunuwenofemarobinuk.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3708ecc36b67573d551b820fa8f1b474/82251852092.pdf
    • http://championshipsportsrings.com/clients/23492/File/tidekede.pdf
    • https://susta.vn/userfiles/file/vikejowizoti.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/69712149731.pdf
    • http://pk.mo/userfiles/file/19064701486.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ut6uugn2q9tq4koup8sqgoc634/95296521243.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0ddcbd0b---nimobetuxigimubapibegibes.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa7c1b25a9---74737711822.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=health+benefits+of+black+seed+powder
    • 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_off0000f9cc.bin
979fa2c7bcf059f67dab79e42184568ee621a05dd10a69f4365cd1abf0a32f16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 16380 bytes
font_01_sfnt_off0001242d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 16792 bytes
font_02_sfnt_off00013c44.bin
d3b51594d476286a960537508d9019e812432b54c66cf1ab95152de0fc474072
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 11028 bytes