Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed3872081d1856c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 23:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6bf8edf45e9aef00e70b33a61b5c918 SHA-1: e6c457246dce6e8d76f4ee0441f5bb47e3ef48c8 SHA-256: aed3872081d1856c0fc97f8e510c054085d23cf1f02b2432c2d5abeb4b626e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zoomkish.com/basefile/zoomkishcom/files/kufitobawimobokoda.pdf In PDF document text
    • http://juentai.com/userfiles/files/wupenigutupi.pdfIn PDF document text
    • http://maksimetall.ru/files/kakifutafikomuvi.pdfIn PDF document text
    • https://aashianarealty.com/file/nuwaketa.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/96f600216d6f7b9735014a5987cebb0d/85848415025.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wowud.pdfIn PDF document text
    • https://allianztc.ro/files/file/17457617864.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/wunaruveforodam.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/kadarowagujo.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210914190133.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/89756130618.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137891be0a1b---17066058446.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/bawedipize.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbe3a9280c---49010102737.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/polikedodaliluxepom.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/lilididojemimowakab.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/zofisewix.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1061307da---dadonenuzu.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///34847014679.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/kejenavupefiduwutomazez.pdfIn PDF document text
    • http://baoveantam.info/upload/files/figujovapuluvitotavi.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/vufiwobamogap.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/pozulefereloviv.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/gapute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+liberty+stories+mod+apkPDF 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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 17416 bytes
SHA-256: 93ff9afe2ccfadf1a4eebac9f9edc67793d63a9ecfa76737273549a3e98ad081
font_01_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 10832 bytes
SHA-256: d8d36dc50a0d0dfd87d29ac4773080e6a277ef3ea53a5a879c9f4b320b42abb9
font_02_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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