Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e0b438c8801cc0…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 00:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00b8dc851fe46340622e1aa05399004d SHA-1: fda22ef8f0a95320818cc9623e0cb862dd40cd82 SHA-256: d4e0b438c8801cc0fff2f4a674866930875a9c379b2d75ffa9ce80dc7b6e9ecb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://laborke.ru/uplcv?utm_term=how+to+unlock+phone+if+we+forgot+pattern PDF link annotation
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/51427004430.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613c09f767690.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/rogalabagugerifuza.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fn1mgpv4aidtpm6ub8656l25j4/87278796520.pdfIn PDF document text
    • https://negaratoto.com/contents/files/27217332620.pdfIn PDF document text
    • http://ud2-140.com/files/30287753060.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/pixepexopikojodurapozato.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/15005049805.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/xifagevabagolu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9459ce8a1---dimubegixamalipoz.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/kunenilutujijapitiruxi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd66e8ee3---42368385297.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/33740237284.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/63427829848.pdfIn PDF document text
    • https://olterus.net/contents/files/ramujitisut.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/niponavoxi.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/89946739475.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/fakopadibedin.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/49026475645.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/57666100657.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/8879146356134bdb0c6c38.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/16061585763.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/71759236967.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_off0000b062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB062 10860 bytes
SHA-256: 54f04b8effd811a98c4f1c7f533d59d5af8946728c6ebbd175375125d6d998e9
font_01_sfnt_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 14900 bytes
SHA-256: 8d1afc5f3b0b25c809f160144978c090eb871066466ffec4b6c1cc98c33c5ced
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1