Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aae216c4072322…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 16:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4fa55602753b3bb7d5ea5b2d681b6c5 SHA-1: 905dfbd9c8497ba634e5d4a0e48849f734848b4c SHA-256: e7aae216c40723228a9e5024f226d8ed7c6d8c28b6840dd2f2c98d2015f5ffc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=note+8+android+10+custom+rom PDF link annotation
    • https://kildevangen.dk/files/zopevopujatetimalixug.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f75e87f4b9---kijuwetudeliwanojakaj.pdfIn PDF document text
    • http://offerparts.com/upload/files/werukurewasidofizi.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wozasitefanuwika.pdfIn PDF document text
    • https://thepainter.asia/upload/files/zilusu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eahjb2m346br6ik9a1q8ibvk92/69090862403.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/9485234141.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/13623952945.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/walewimaxafinabapubiseb.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/pudefodiwunoj.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/bunitezanufuwejunoro.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/dagosoves.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/bac5f363eeb0146bc089896de23b275c/figetisodebidovef.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/76958822880.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/lomugaxizufoleleputiso.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/duxowizifuxoxabef.pdfIn PDF document text
    • http://groupkaishan.com/d/files/38024399590.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/38798822121.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/48021958693.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/82074460660.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/38733648543.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/badulanidul.pdfIn PDF document text
    • 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_off0000c24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 10944 bytes
SHA-256: ed6336d9cdc4238942b0b5a778b3bfc4923495a714cc562e9e6d1708d88fdcb2
font_01_sfnt_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 17436 bytes
SHA-256: b281bf60c872a369db51e3595e9456be40d34b28d85d287adcf5b1cc26452adc
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1