Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e54e9470765f77…

MALICIOUS

PDF

102.6 KB Created: 2021-09-06 11:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dee9666fe7b40791c887ca2c2394a4c5 SHA-1: 44100e107685d710ccfc23c645e278fe48cd91fc SHA-256: d8e54e9470765f77ea77038ceb92422c5ff70f174f3ffcce9a145bdd9895e38a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98da5b8087---55411595346.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c59b75bbbb467e329fbc436cc3858700/18343924010.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/towogaxiripinugewexakone.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/punojuzugojix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74866e427---totusuvenanesosufi.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/85993465458.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/wexavopuluza.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/48382271223.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/sirojubog.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/67424513458.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608114a654851---telore.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/svl21p0n18l58hl43p9bobi1sg/sepogutudutifewuzijonugi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088fad02fbac---6663798788.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd28ca19b09---35170386669.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/zupavewew.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/rukizivemopofo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd517d2d9---11053474479.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f33245b1---fowonopakel.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/zivixituroxa.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/16228289634.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087eafab353e---95025243921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=piriformis+muscle+exercises+pdfPDF 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_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 19668 bytes
SHA-256: 5d1a4ca5aa40a9deafa14c4dff86304e4becd62f736cbc52b17920690866d371
font_01_sfnt_off00015c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000174a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A0 10620 bytes
SHA-256: ca3c58a1698956ffb289f78b4dd4dfa7cb3935d0939024af4c980e0d7ff0b30f

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