Malicious PDF — malware analysis report

Static analysis result for SHA-256 42364fbcf2f156e6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 07:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71c12d4207f5d876f2cb50e91dc6535e SHA-1: 92d62ba66ef4d48e6aad6cde4e0cd8cd087318b6 SHA-256: 42364fbcf2f156e66338de334e956946e76ee37ab1b9e045a4499af85416923b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content embedded within or linked from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a6a512a9---27288309211.pdf In PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/71080615454.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5f6a6d8b68510eaded5174d1ae4f91cd/63419561859.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/vowamewoxemedejago.pdfIn PDF document text
    • https://dm288.rs/slicice/file/6427404877.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/57609778197.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/rekaguzikuzovabinoj.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1873641b4985aa2957f12f403d61f317/jagelowavulaganutepoguzi.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d4b0209563e6570628b6391baa44b8b0/pajegobi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/h105r6pjf49sr7diddve4htajp/zatetijef.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/62i1jfiklcr4jcps213bp214h1/96421195333.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/88453370476.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9vbbqd3gtnaf3ghud6vj02gff9/61226087835.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/f3a10a582b7c803204fbeeeca954143a/dimiwivixarudimadipejugis.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f7f33f74---49279514439.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/14453743939.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3ee3886d---mamenavejivivudarapubumu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/udm2mga530nc0mo99kp5jc7geb/vuniriduledirokiguri.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/33975349285.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/sewenufotejegosupagisuv.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d4bc7caba.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/v6n8g8ib13cmgj4j8amr3v23bb/49594678478.pdfIn PDF document text
    • http://jaatkinson.com/userimages/gixagukogavud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=organelles+of+the+cell+and+their+functions+pdfPDF 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_off0000c244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC244 11024 bytes
SHA-256: 90d69bbd0ec6dbf0a32d8b8cc64ad61af363f27baf5d464f03e5d7658c25b024
font_01_sfnt_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 16824 bytes
SHA-256: 6933d147cb4976208208fdbfbc5603c72a325e68295136f125a5bd139e9d9626
font_02_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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