Malicious PDF — malware analysis report

Static analysis result for SHA-256 606ae8e5e3ad8e0e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 22:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8869bcaf58ad5cfad88c8cf5692e55ba SHA-1: fdbdb20af5a8f8b4af84f397e394ead314c9d9d6 SHA-256: 606ae8e5e3ad8e0edbb65b98274afdac2e9512a020d78fd7e9de8267737b1e60
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the file as a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kortennis.co.kr/B/ck/ckfinder/userfiles/files/9144410336.pdf In PDF document text
    • https://hoanghaie.com/Images_upload/files/fewibutamaj.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/futokumabokubope.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/57389183098.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/26007640010.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fb81a3f8b---bozugilosap.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/99655538986.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/kewibuburovosevovarorupe.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/19684e2d950a5dd4865488f1800eea85/18261515011.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/21139620181.pdfIn PDF document text
    • http://kleiberit.ru/files/file/80209694595.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/73123111691.pdfIn PDF document text
    • http://iwishop.hu/file/70946058550.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e54077ebb3c---20551267353.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/5335158861.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d15c409e---98739927951.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e3eba73a0---42065831417.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862bb5de8cd---22493988480.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1dcec157akjjstvm7rsblneq04/pabikorekojolilabavusu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1ssbeg6ptrtatvnq9duu1g4qk0/zolakebosasupazuvalovez.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210803_86F02366A01933B8.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/kuruzujedukawafosexoxino.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/55149390421.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/48410142356.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcf5388cf8---17907281749.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/20043186227.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/54602619661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=matching+activity+worksheets+for+preschoolersPDF 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_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 19536 bytes
SHA-256: 71066433bc0fa9bef6cb83b02b281c750d8ee4d9b7ec108ef3f5302f529218c2
font_01_sfnt_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 11108 bytes
SHA-256: a800ee746de288f80c34412b66080c4453d8b4c58cf8cf5b43438a81a63c183d
font_02_sfnt_off00013341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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