Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a7ea269da88e55…

MALICIOUS

PDF

76.8 KB Created: 2021-08-21 04:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19cc23642606479f102b8b73261423df SHA-1: 70e23bcecc7c160c6adc475474564baae4aa754a SHA-256: d4a7ea269da88e5586a9a7d3da1ad50f7b49d7f38ad0a1f90a0ac0cf1cd7c1d2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dcoderesearch.com/uploads/49304475084.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/56446721838.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161130fa965699---nisowenepizupipedaw.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/kefakejoliwetan.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eec23197fdcfe7f2be1967d4395ead1d/67371470659.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/88825375990.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/ligivuxobadutijubupegev.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3n0pi1e819jhvjjbi07phen7i2/badarolizedirivemiza.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/09fj437rhpuh02qvf5bctemak6/kugumidadufevebes.pdfIn PDF document text
    • http://beiks.info/public/file/34491875912.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/jeloj.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/bamezapadota.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3m54f58is7t4plql7mkbr62bg4/befepidomipefazijox.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3bc48bfcd---menazazatejuxokivoxob.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/jesegubuvis.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/fugokakana.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/73375864060.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b85dbb92242---baligat.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/43592e09e745c36735f127c173997678/6358244899.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/kosolojini.pdfIn PDF document text
    • http://yjccnc.com/upload/files/potolobemetava.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/xefagorirovafojepav.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2b308237---tajefenoveboxasupiw.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zobusikujir.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1ba2945415bdce95cdae8c53398ab509/69883627055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mitosis+webquest+%26+virtual+lab+answersPDF 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_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 10156 bytes
SHA-256: aff7ceefd1228e7fb204abab6f5462f66e1ce4fdb1f19ada98e0defa165f3af8
font_01_sfnt_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 17172 bytes
SHA-256: abd10bec01e503941ff84810ab05ed39ca216357cec3a10909d5f9d04c01fea5
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1