Malicious PDF — malware analysis report

Static analysis result for SHA-256 900fb0361f4812a3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 17:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 514e41e811dd6ff1d21f890efcf32a71 SHA-1: 8a6c67f9df1e68b0ab5e6853676af0792e66c128 SHA-256: 900fb0361f4812a395aed3e4f333cb07111972ebc2caec0f68b001ab29e73856
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable domains. The presence of multiple external URIs and the nature of the hosting suggest an attempt to lure users to malicious content or phishing pages.

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://jurabos.nl/include/editor/file/33430491062.pdf In PDF document text
    • https://civilkontroll.hu/uploads/file/dutitipemewuwalomu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dbc8cda50---wagijapivosobuwatitukip.pdfIn PDF document text
    • http://cutskytools.com/d/files/wefarakidogixeruxi.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/40232585376.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/keworixodijinazoviwawub.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9c261422---wirejolenazol.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/39727d0c9db226b4492b1bcc09a977bc/33955602808.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/63196684106.pdfIn PDF document text
    • http://gro-felix.si/uploads/noliri.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bazuziri.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/87100021687.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397b2520bbc---dibajepeduzelup.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/jetifigaxux.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/lakotara.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/mojudofofofudisigoduj.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/degimilemex.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/lonogumivunejidifupu.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/22873649343.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/42313081712.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/motabijuloxuk.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dinujagexadedav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chat+android+studioPDF 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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10296 bytes
SHA-256: 98067a715d34b58bff2759dd038cb6306f3a85829b28398639dadbe1dddaf196
font_02_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 18432 bytes
SHA-256: 7072fff0ba249a27782736d460500aeca8a91884a34e10c1a7034de8fa1520eb

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