Malicious PDF — malware analysis report

Static analysis result for SHA-256 155f7d23df0826e5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 09:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4824e55ec33431a0ed873b6555c35023 SHA-1: 9afcc6eee5cb699d9f9c690fe9e9f16046a4591a SHA-256: 155f7d23df0826e5390dcf002bda94ddaec8f07e0fbea5b03891f7c000e044c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://studiopol.it/userfiles/files/tumijis.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g7534osa0pb4928uiqrhqrrlp0/9541165113.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/genekatekazifumuxok.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/jazivunovuj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dba1c43fd---96794348883.pdfIn PDF document text
    • http://wsm.hk/images/files/xixasa.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/qq9afugbdu2964eoo2j846g3t0/9527087233.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zupufufikapapi.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108311547158893.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/24898888901.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/mimag.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8f5cfa046d0a6e654042e9cd87186dba/22098858910.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/19933595455.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/waforifibisozejib.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/regefitaxutipesefavakumo.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/23647020649.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/paxomigubo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160729f7b086ef---zawawusefex.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/35929213020.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/81679831364.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/081o7suruldju5uodniqm6pbe7/pamefudurewawezipag.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7b3828158fce904850be4af914e23eda/88395805042.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///kesivowofepovaj.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tl872oo15t6c3ms5iono4cp45b/jufokulusifatijupoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=low+blood+pressure+and+sweatingPDF 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16864 bytes
SHA-256: 9c17e026d1b526ed9b62bec15a5982eafcfac1ca02f8d8a057c94bf6cff440c4
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 10852 bytes
SHA-256: 4249dd7aed86305607c871cb023b96e920ea1c97c5e64fd65d1c410bd086d28a

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