Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ba70bd557843ef…

MALICIOUS

PDF

87.9 KB Created: 2021-07-04 00:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d689ca15596cb49049a563a27a9e6d SHA-1: 8574714e2b9506d983755c817132494751ba6ee4 SHA-256: 56ba70bd557843ef9bceb9e43ddbe7b31cdf83e2fede6984e44a7607057c5eb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/74a229e2c37224b1ab5b928c7ebf18ab/52819468275.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/9414c269b29b287a4103b0b273e7fc69/2137979590.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4209f390c4---85024498768.pdf
    • http://geometrabottero.it/userfiles/files/darutokewobolojot.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f156c4f9a---kogojopanomozezaketulomig.pdf
    • http://karat-dobremiasto.pl/userfiles/file/45813601571.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cc13fd8939ff8db3468411d5f6d51ff3/93253346428.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5rhmqa33at8ptr0ir00fruljk6/nuzezujalenoji.pdf
    • http://bualuang101.com/backoffice/upload/files/betimokipezoxunemekufi.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b6166111---86028576188.pdf
    • http://kirsanov-maslo.ru/uploads/80660015674.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c960972f7---nijijev.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084675794364---62965971352.pdf
    • https://hogies.com/includes/template/uploads/file/16418345327.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16097e40c1db27---57333003941.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11e692a88---59000154268.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc285fb4e---sugadasi.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160972c2079ea7---borusevipeloritinevosi.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/71621126597.pdf
    • https://akamercedes.com/images/uploads/files/4571498523.pdf
    • https://lymfologi.se/anvandarbilder/221/files/koletomapupetidebogixa.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/62096105211.pdf
    • http://www.asslar.de/downloads/61651388084.pdf
    • https://alihuata.com/userfiles/file/37530391744.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=and+then+there+were+none+vera+claythorne
    • 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_off0000f427.bin
9944ea3b0b0ca67154bc0724e559e0da1725b2f1e8f3787479a452b21ade1ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 17616 bytes
font_01_sfnt_off000120cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16792 bytes
font_02_sfnt_off000138e4.bin
f197dc2eaad0064fd165e728255896c6626fd0d04bca9d53872f69867b359e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 10456 bytes