Malicious PDF — malware analysis report

Static analysis result for SHA-256 b427563d75140a1d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 07:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61793f163fabc66e87eb3bb05f0af93c SHA-1: 554de321a942a13c7376e75dc6b671aef1b067af SHA-256: b427563d75140a1db0165a7f84f8f465b84cc90d1b7475d806221413589d58f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on what appear to be compromised or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://lazeo.nl/userfiles/file/punularasatamokazela.pdf In PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/45795962594.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/79d33e4777bc5eace1ee10c98195f967/jagarinisil.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/97094078224.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/pewexonugopupusunoruta.pdfIn PDF document text
    • http://ned.ru/uploads/files/munumup.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/mitewajefimekidufavimogu.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/fidupurorupu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///65127484607.pdfIn PDF document text
    • https://beautydent.hu/editor_up/92986805803.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/29768072292.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/numigufumugilotefepi.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/69934099213.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/jijobuz.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/81727506243.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/90299810821.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e9339f39b2a3bdc71a418f1abf751d92/taveremixovununik.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f19a0988f---68235522853.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/bujetubatokoxogusix.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/buxew.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/pemoroza.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/43415709504.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210919_81BBD72DFB8C8E99.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/dajivilonunisenorikarodu.pdfIn PDF document text
    • https://preciseenergygroup.com/media/50456174791.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/bonoradoburufosode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+most+wanted+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB443 10496 bytes
SHA-256: 095b675f083fc8cfeb4c23458c113bf1500846ab728fb1f6ac4938304d6969a3
font_01_sfnt_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 14364 bytes
SHA-256: d2ae389225a9a943ea981764b114f49dc5392d65e23a2703b85166872f0af42f
font_02_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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