Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6fa625cf761f4bb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 10:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7983dcc2aed5927caf44a4ef29a4591b SHA-1: 34c8722a6f4c76947fd180683c5a2bf53935ef1d SHA-256: f6fa625cf761f4bbb1397760d416a0d3f577aef61f59e73409e22638187b1dd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs, such as http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/d51n383i9g8j107laq59mk67ubo1gtih/55047335710.pdf, are designed to lure victims into clicking, likely as part of a broader phishing campaign.

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 http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/d51n383i9g8j107laq59mk67ubo1gtih/55047335710.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/zifovomojupig.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2a15cbf1281d96375e6b5e71078dfb5d/25400346178.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4826ce90---tiwujurakazuzorobeki.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/duvuvoxiluzabeg.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/99580552697.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/76668446337.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/kopijatimedovujoxusu.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/48248316046.pdfIn PDF document text
    • http://yarpaket.ru/userfiles/file/kokufefupesetexaxagawavi.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/vonali.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/wanenidirigegukevenu.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/45944433800.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/tuwesa.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/2145817996.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/93752735960.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/wasozibageti.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/gikonikodujufuvuxej.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xewakiba.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/67769040390.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/duvos.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/87786456443.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/11520341034.pdfIn PDF document text
    • https://derfo.info/resimler/files/wekibotezarifafewon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what%27s+the+best+app+to+hide+appsPDF 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_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 10408 bytes
SHA-256: 7a0b7d78de17729d6d754ecbfdca9c430ef89369783ae3c8655a63b1111ca7d2
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 17700 bytes
SHA-256: ce143b8fa88925412d1581c70eea5baf794e4850405c1f0afd6384053e819936