Malicious PDF — malware analysis report

Static analysis result for SHA-256 8897ca5ddd97e4e9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 07:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a15df7c32179cfafd9bc352ac90b0baf SHA-1: 33c991897076635ceff4af5b9f0768e41c21935a SHA-256: 8897ca5ddd97e4e97c93f704620faa0a388fbb8e111c462ddcf3477eb861c8b1
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=chrome+key+commands
    • http://clubselectionvoyages.net/images/file/rodovixigixigusorovexoz.pdf
    • http://abwmountvernon.com/uploads/files/nokedafizavomami.pdf
    • http://ediljolli.com/userfiles/files/dezalotagolabog.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1c0354cb925189461adaa5167b06a74b/30616647115.pdf
    • https://strategieb2b.com/userfiles/file/90089943401.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lategasesipikebaxuseza.pdf
    • http://nanumed.ro/uploads/files/75887600163.pdf
    • http://baugeraeteverleih.de/benutzerdateien/58021647121.pdf
    • https://parlagame.com/calisma2/files/uploads/60551486744.pdf
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/67440046189.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/rofelakurusojoloketo.pdf
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/duzuvufokemixaxexaxim.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/tenizuvesewobasemesilude.pdf
    • https://membermimpi.com/contents/files/dujes.pdf
    • https://a-metal.e-giant.net/archive/file/files/punalexovojiwimowareraro.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/62798601402.pdf
    • http://willbramephotography.com/rodusexaxajagagikipurune.pdf
    • http://watdoenwevandaag.nl/upload/jedufododad.pdf
    • https://augsburger-dartliga.de/uploads/file/winiwijajokeva.pdf
    • https://dbmotorbrokers.com/userfiles/file/jifuwosubenamupep.pdf
    • http://vasset.bg/userfiles/file/97617955616.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332925117f3---21789057193.pdf
    • http://schokofontaenen.de/idata/49176944969.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2b5e46ac68fbfb02627d94d9e8f632e0/matemazawoxadolasazojez.pdf
    • 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_off0000c109.bin
3683d1c005648c2aceeaa85e06e78b7ceecab506455cdf252368aae40d39b318
pdf-font-stream PDF embedded font (sfnt) at offset 0xC109 17232 bytes
font_01_sfnt_off0000ed75.bin
eb6e000ae4eef5ac4009a21a65f090cfede7011ef8ee2cb05daa4d287cdda1b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 10636 bytes
font_02_sfnt_off000105ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 16792 bytes