Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84a4311377cfe7a…

MALICIOUS

PDF

80.8 KB Created: 2021-08-16 12:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c5acbad077c7fe5a2ad93d2b13fbfd2 SHA-1: 1f783ec04cdf5c3b8a8a3e077daa6843c965c7d1 SHA-256: e84a4311377cfe7ade8d3d9264a7eac5cde6ddbcc7021fc4758d9ec237cd0940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inprovit.com/ckfinder/userfiles/files/84269406356.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9a784ff322562ad5038015c2adfc017d/19804032497.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/zukegiwasuwexabejirisufil.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44b313dbb---41524888036.pdfIn PDF document text
    • http://ucity1967.com/clients/f/f9/f95c10655bf48216a4b8c8e4321ec146/File/falejenewubirixen.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/92833029309.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/wagaxodi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106269e6b4a9---kuxebepubekis.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/99238547376.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21d2223b0---kexepavorelifetiboginoj.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/kezumuzumaxijebax.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/wowawisugalikowira.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/99478640857.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/vawemipikuxus.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/10532072122.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1628254375943882594.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/20665098506.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1nipuuqt3rd12kh2p0i04521pp/60868377365.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/50740392204.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1689a902a0---79758716811.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/73f37fb0a65fdeda202bd12c7be40326/17088025252.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5398f43101467c1bbd9dfe3014ed4060/vitugi.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/tefunizenas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=john+deere+310+d+backhoe+parts+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a739a8db531a126e83b9ae1bffaf1739/vekalumiw.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/kilubigogiloterugazog.pdfIn PDF document text
    • 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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16224 bytes
SHA-256: 3ab69ef3a7878edb39969939e47f254b4cb5e6dc14cfa20cde2c003e699b1376
font_01_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 11356 bytes
SHA-256: 40aa869a858439bcbacf1b47119467e0473af5ae069359a9391a26514aa91d1a

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