Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8054ce4bd6c33b6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 05:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3215f16e0367d801d49a7ab02655da86 SHA-1: 6758924370bb3dfc7b40dcc63e143a4ce456c8ed SHA-256: a8054ce4bd6c33b65d53fbf60038e487c7b24e7b22dcbdd86ea471fe5369cb0b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8bca4cfb---zonumopatopipikaf.pdf In PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/3271760202.pdfIn PDF document text
    • https://samudra99.com/contents/files/47255434528.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210909_7B35885298A47701.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/56602717125.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402030eff05---tukumi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdcf450d39---pavizufaritibekanefejuvo.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/mawokud.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210914100138.pdfIn PDF document text
    • http://redactron.com/userfiles/file/52305705893.pdfIn PDF document text
    • https://semut73.com/contents/files/85724896802.pdfIn PDF document text
    • http://robbes.nl/media/files/janoxunigekawojepukedazo.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5998790058.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/35482062678.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/fabazovokofizujowo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161409bf4a25b1---25585403887.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118685ef51---61737382046.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/kilutajomexikufufefude.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/novirojanazu.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/4924417697.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/tiripulasozizu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fc18lp2h6pvupiererbjeac7te/zesagivise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vanishing+time+full+movie+eng+subPDF 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_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 10836 bytes
SHA-256: 53a717829c501e6c56f80c85a3649bae4945ece478d966e6a0d57ebf6baa654d
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 18000 bytes
SHA-256: 758150cd3185ac28fa582a0d8d20fc9514b82804ecdbac80cd62469356c8c4e3

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