Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98c113ecaa16bce…

MALICIOUS

PDF

80.6 KB Created: 2021-07-08 06:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e5a794ce0d5e7e10e05cece52c5f4ec SHA-1: d2ff50e5fb97144e4a37166f85d75476318472f4 SHA-256: f98c113ecaa16bcefdfa75982ae6cc33dc963dfc260a44b4f0e573128516324f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://wuxihemei.com/ckfinder/userfiles/files/20210628_215344.pdf In PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/nosujapatuwijiwinesi.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/wadozodobafo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ee47fdc416f327a9dc1849f472a66f03/72448324455.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nflfuvevn11fcmnpl9h0cf80pj/8664285580.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/95561247af5a8b0a5bfdabd37ffafc08/sezoban.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9i9jt04u38n7qakd0hqm3putpt/buloxonax.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/gizodudujowina.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ffcb1472d7fd75a719fb7f2223fbadf2/dobeko.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb57864bf94---59072297609.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/70562550341.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/lowikeborurijelanavatab.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bakavanitoxogutise.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/wipupufokanamamuxa.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/pidogijateganoburijexin.pdfIn PDF document text
    • http://chamdure.com/DATA/files/nakosiwigenaw.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc0c25cd4---77059105287.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/92dd5d0489af7ad01dff1d0f383e5ac9/fogelebagadozakav.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8c9f9273b5288c9f9724c5d365f5833a/54622929000.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/duravilenav.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/jaraf.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kugoxudirenekonodoli.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c888850a0d---82729907805.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/74180764425.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7248aed994dacc52cd860cb1c9486366/13379833799.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac0c923b2---80819839281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jee+main+10+april+2019+shift+2+solutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 11176 bytes
SHA-256: b73c53b44374930bbb755625c8d3784b15c54ff8421653f06241f2fd185cf166
font_01_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 16448 bytes
SHA-256: ec61a5f3e859fce60e512dcadc61a9bdb2596cc4a52066a75081ed01ff276a2a

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