Malicious PDF — malware analysis report

Static analysis result for SHA-256 082158400e58e667…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 01:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aef914d27b67183e7f8a1a8994617587 SHA-1: 70df78b22b4ee016872e4de2b93706a94ebfa0f6 SHA-256: 082158400e58e6674de62ded72369a8ffd3071ddc1d68408b548339198853536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains, a common tactic for phishing or malware distribution. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate redirection or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=diccionario+de+etica+pdf PDF link annotation
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/39465609460.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/12302244788.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/18725761524.pdfIn PDF document text
    • https://slide-bearing.com/d/files/lapebatonivikiruwosifuxe.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/7418055373.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/14446522400.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/xulemijutilakip.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/66039296486.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/66780847885.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136697227489---44301478595.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d80424995f---vifojutimukitepurapulerez.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/nojisaw.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c51e082fb---butuxuromebalewus.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/f4fc024qkor099jipri29pkohq/suzivizelosuwulamov.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/wiramaxo.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/55227183109.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/83456583033.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d0a1e737---49196259822.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/gobebarukaso.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/sesakewivowijidez.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/89878335127.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xopulalaja.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/lajojepufujapavu.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/dolakunipomesirubasalibiw.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/23846567989.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_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 18504 bytes
SHA-256: 58814a96e142f633320c361894e4b639b755148133a79aac55a0c1365db7cab3
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 10400 bytes
SHA-256: 9b562c91d34536d5905b3c4b4bafd28e056ac401e586a72e447ce703fa3ec0f6

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