Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b4d6f71d54c7db…

MALICIOUS

PDF

91.6 KB Created: 2021-07-07 10:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1ac885e0fdbe7c3fef1779bd355df6f0 SHA-1: 5fd8edabbf00bd8e8814a310921e318f32c79182 SHA-256: 75b4d6f71d54c7dbf0bfbb2c444b4ed0aa32cd04bad51c647b698086fee68fe3
164 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of a visual download button lure further supports the phishing pretext. While no scripts were explicitly extracted, the overall structure and URL distribution strongly suggest a phishing campaign aimed at delivering further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://allytemp.ru/uplcv?utm_term=dental+mcq+with+answers+pdf PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ofvuqq6qgbv62d4tf7c3165jvv/govunedo.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/65585169599.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5ea6e7a139fe50c709ee04feb73b97ee/29089063462.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7e52c355---bulepovikatawifitazazoron.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202163932498071.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/rapavadejofojasojef.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cd8def0ed7ed38ceec1bfaa4b5826216/giluneli.pdfIn PDF document text
    • https://mszukam.pl/dat//file/keloxalugidivod.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a276d840e9ecf2afda86468380da9278/13565786796.pdfIn PDF document text
    • https://telenovella-bg.com/files/29798052470.pdfIn PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/lafafavopuxuwurekan.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/34450384392.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/womujopa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe6bb2b8e---94130544034.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ioi772lh8t026cjqigh23np3tt/33342758630.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d0aa753f3f4257d2bbf26559ae9965ae/29499074472.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd66f00b23e---loxajujukajivopujukawo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091211908e96---4497280390.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/mejudi.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1620551038.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160de8032f12c6---wixipininajebapojamewod.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/furele.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dobuzupomimopapekotesoz.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/mutoruse.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/17394116329.pdfIn PDF document text
    • 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_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 10996 bytes
SHA-256: 94cecbda40f94bafb4d0f11d0d8aa844b8f27cc56ff22cb51726d32cdb1580f5
font_01_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 18464 bytes
SHA-256: 9b09ebb0f0c4dfa2a885e02d2ca6c058515fb2e681d992f37ae284746bd7ffdd
font_02_sfnt_off000148e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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