Malicious PDF — malware analysis report

Static analysis result for SHA-256 6281b601ccf8e81c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 02:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5010b137571a9f61b1d94b8266ee2c8 SHA-1: 4ee41df29321833a597555dd7558a1df30b8eabb SHA-256: 6281b601ccf8e81c9424b85bb49e4e14c17d5231e0302d5ab1cb908dbbfc5e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV heuristic strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://pattarasawat.com/ckfinder/userfiles/files/92299009943.pdf In PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/xisaxewenodumavesaxu.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/97764577838.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/34947879985.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/26860802769.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/patuniwob.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/zafejupo.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/48497569905.pdfIn PDF document text
    • https://hsse.cl/files/6329721431.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613452e9169db---sinuloxaf.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/rujebakinakusugiz.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/54264325763.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/54515663746.pdfIn PDF document text
    • https://tigaintan.com/contents/files/95961560462.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/40190992732.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/gimajezewuxemodefesinuv.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b490cc532c81ef1a7ad5fdb889c69edc/29731870407.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/46697dc9bed9255991ecef878c8aeb03/48672098471.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/4769009041.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zovegujariro.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7652aa2d---88234662493.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/ruxuvogogutigizerizabek.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/97096608622.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/nawanabufivugimevixi.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/sikojadowasofigu.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/mozotukamojalasipefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+facetime+on+iphone+to+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_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 17344 bytes
SHA-256: 3175717b42fe5f1cfb562cc27fa487930cd86a15f8753ab3b4a6e8fb1f79065d
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 10748 bytes
SHA-256: b510f9fae399d42db6ae5e7c13cf5c33f8a16e64d865b63199c2c31afcf75c0e

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