Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c080b8592b75416…

MALICIOUS

PDF

85.6 KB Created: 2021-04-29 23:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 735f333ea3bc0f493a295927350560bd SHA-1: 0529271f26a4616ee279c40b3dc1bda98782287b SHA-256: 7c080b8592b7541626e8c57d67538106f3557c4c010b87f2a5ff1a3b5333e399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to an 'answer key', a common lure for phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a28519d91b5096cc982e4c276820224a/62062831293.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e7b2b9345117d4fc1ca394c7abf3d9d1/risobubuzonezodeses.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ec921300761d4886377c044017fac99/32526219142.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/91804409712.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f2f63938---regimig.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/uv2i0dnu36r32e5cg3nu87m1a3/kivifiru.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608837b723c14---kexafigotafulinegeko.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c59d6a874---vebakenasigupuwonovunexi.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0168ba1b5---67103555182.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9452ce47b---jodojuwosukoxekevevef.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc23d2683d---70280491230.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184b510e13---xisifojutuvo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/sp7tpacvampe9vr59jkcjd3fiu/xadalatewobu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160810668d4b9a---48023577534.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/316486f97ec2765be3e4f00d538a78a2/zuvidanokida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mpsc+sti+answer+key+2017PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 3360 bytes
SHA-256: 6c94374b3a99292aa0fea678d06b4f4b6f25daedd70264c7ac4a85d9c3dcb7f7
font_01_sfnt_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 5564 bytes
SHA-256: f82884daf042ae04d2fe1e9a7b81574954839af5b7b199fb4b9ae65c496fc2d4
font_02_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 11004 bytes
SHA-256: a95a72507bda41eed2f698e382bc3c977d567307df514b4e3f0c17605dbc79f9
font_03_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 16072 bytes
SHA-256: 2f43f2fce984d7b78e2f3cd346520c16cd91a0c4d012e3286b6ab88c243de442
font_04_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 3576 bytes
SHA-256: cefdf560a12878907e447cecf6adc1e4766e463f8641bec1a9ccd82e89ef4336

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