Malicious PDF — malware analysis report

Static analysis result for SHA-256 d325c5deb7590c4b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 08:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eca0b775cbd1b71284ad6deff5c3121c SHA-1: 2c68095749a754f8d90ad7819a1819f7a7199259 SHA-256: d325c5deb7590c4bc3056824fda853838496ec945d71e15bf3cb37089b00c450
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/oru55injbe544p5o1ginb3l9g1/93526055293.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160941c9c0c7a5---zeruw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5754a2cb5d---kifukejibemunesete.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/gufowa.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/wikebilikaziwewojejazaw.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3e240212f0755734cdceed3855496a58/zibifadofukeri.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/53505973745.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mosexodofujawej.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/8606434802.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd62b12649---60867882833.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/44472739972.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/kuxilunafisizagolivavazu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/95ogpmg87aa0ksu8ce7gamvvbu/10782691658.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091dbddc2711---davafozatovat.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/napodoperomojarafaman.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90e45d91a---korajukiliwisi.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/muxebuvuvurij.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb7808fe6---39088805272.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1e3ea1afbbf3a2361c0a2615ba224342/47629607417.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t0fv24g2mk025mdkcgsnjfj2lc/48325580239.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956f63f2c1---dunurufaroxonasonefobuwe.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bfcd9bed---nepemajuvomidi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb00736f3---jiwamulurojuvumunapegip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cardiopatia+isquemica+cronica+pdfPDF 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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 15524 bytes
SHA-256: fb0e1344c4e2abfbd4b14d44b71247c6608b805082fbb51ba30d16266c42372f
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 11012 bytes
SHA-256: 7442e8338e8f2d562a1a25f79dfa5478aa1fd1225858a634bae8484b1228fdef
font_02_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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