Malicious PDF — malware analysis report

Static analysis result for SHA-256 755cf3f83adb1f09…

MALICIOUS

PDF

72.8 KB Created: 2021-09-30 13:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a46f34d8df9375c12737f0bef94be5fe SHA-1: 429f37e3dcde604e85326ee7f7794d13bac00ecc SHA-256: 755cf3f83adb1f09efd1c617075c895ab029569f4898d6ad1e9c3495247c3f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to lure users to external sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/501946a404b80dce481f6be23bec697d/rofafejenelosodazuweped.pdf In PDF document text
    • http://abworder.com/uploads/files/vapurinalonelakijin.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/naxexejanorimefexot.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/jomepusiwiboxivewo.pdfIn PDF document text
    • http://zimmerei-possert.at/22979738218.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s79ep73sjg41r6in62jnktb2st/newezokomululekubikis.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/50168107318.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/31035173595.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/32880033716.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/50847214015.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/12910382422.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/zidabutelabesokureju.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/tilibizawegukogefufaned.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/malowutixewapazajo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/9502502474.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/bowawuxewapuwikugamuj.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/fikerovuwubomimutij.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/53651585338.pdfIn PDF document text
    • https://gdaniec.com/upload/files/17166688767.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210902_0C8A8DBD04455247.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2qoajl2ncvusfj8s9c4h8fhu3r/riduletadazobonumekupopab.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210921_A154F952FC52B866.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/denaguj.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/30760238850.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/37754046119.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/76138244616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=snyder+cut+mp4PDF 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_off0000ba25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 17408 bytes
SHA-256: 7f740a30203c6ae00b1bc03f2b04249622550cf70670ce7aabd6ae4508ff02ca
font_01_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 10456 bytes
SHA-256: 9b7ce9e54271dda0d2d21059bc64c01a10c1c3321f6cee0662943a37634d3e1f
font_02_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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