Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a55f9e906725fd…

MALICIOUS

PDF

84.6 KB Created: 2021-08-31 16:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d82339d99fd94dcb3838b7db4642d386 SHA-1: b6e7e05d6e7a53d9396802e5d9d90f76f2e85a34 SHA-256: 53a55f9e906725fd3b8e8a62e88291e7732408eb6d4c23ad149fec4f43c52171
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress sites, suggesting it's designed to host malicious content or redirect users. Embedded JavaScript streams were also detected, which could be used to further obfuscate the malicious intent or initiate payload downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://liccuza.ro/stiri_files/file/rotame.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/de01cdb76ea1c102c89319e2b459872e/tokojuwewafaxavi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/75127718e8945e44bf3400070467dd16/77567494855.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/74acd7f69ba36bd550e08aabe746c011/5927577818.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/xidifidivasapemabeke.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/94284576263.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/vi66o09lgicihok4mafuf5k637/73782343265.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607887c8e162d---30475673717.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wamakaba.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/dujubujosidinebol.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/75179147131.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba99c2f0c---subosatusezupalura.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ce9b01c0c9510f86099d73fbaccf1029/97107195340.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/af1962b7af9cfb503692ed47a6d44479/65402207873.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/56063994795.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/widawex.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/widisanemovopisupa.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/lesaji.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/3398983664.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/safifemuletesiroveb.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/eb36f226ce4247723f607c8640fab68e/koketewewuzobumefafe.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d039e4112---80164447484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+warrior+in+the+world+historyPDF 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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 10600 bytes
SHA-256: 71ba38c5e07aaf3fbf19b84a794169bcc04cf06f4f12e63f1e666be59ad107ee
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 18256 bytes
SHA-256: 4fc14ab584346fe72012fb39a150e2a79c53ea503e854602363b9d532111ee97
font_02_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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