Malicious PDF — malware analysis report

Static analysis result for SHA-256 153708e244ee1643…

MALICIOUS

PDF

82.1 KB Created: 2021-10-05 05:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1578febfe52e44285ee4ee195cad8bd SHA-1: d606559fd9f7c313cc202b6bf6cc0ebda8edc0ee SHA-256: 153708e244ee1643a196ba2aedf9b7095d0d705d6cdc35512fda63f2d721f27b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to provide a password for an archive, a common tactic to evade gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://philabc.ru/uplcv?utm_term=animal+jam+usernames+and+passwords+with+rares+2020 PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305de995291---gexugelex.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/5877544748.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/daguvigurebuzijudoma.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/venekug.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/54290968335.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210908013416.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6291a395---17751718159.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/26493806221.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/8283743626.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/dogumanuveluzan.pdfIn PDF document text
    • https://etimes.mn/uploads/files/sakun.pdfIn PDF document text
    • http://fnathservices.com/upload/file/devejetazijedonunir.pdfIn PDF document text
    • http://beijingteye.com/upload/files/41470918283.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6e56da702---89224886217.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/nolase.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/mejipifijufifuver.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614331fbcd9c1---53139354562.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/40456609289.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/91402683644.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/raniguxaminuke.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/26039470705.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/wulejofaralu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/a557j3vorlirir1h5v1jds4qu1/sajejevufitovaxo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/58037634262.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/82902003632.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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 18776 bytes
SHA-256: 91783592a46a82019913ab271ddecfb0cf5ab31220ec091914ef1cd5b72cbf92
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 11196 bytes
SHA-256: a6631b1f31fdfeab0d08990e4a50f855390b33350be68da5ebe87966604e60f8
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1