Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5bc040b7777f1a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 18:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc00505afeb27fabcbb55009bd847c53 SHA-1: 6f661f239244579315181f66914c155c0ba775ce SHA-256: 1b5bc040b7777f1a9261dc19fb3f24957ab8f6fa5d42431e0435e3c9da98a28f
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or IP addresses, suggesting a link farm designed to redirect users to malicious content or phishing pages. The primary function appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=what+is+a+compound+sentence+worksheet PDF link annotation
    • http://mvpbuilding.com/userfiles/file/tetepil.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f01e14aa---viboporegare.pdfPDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b937e8f37a---dazaxugiwajagasegixa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b15ab93d---20012933055.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/93882044914.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cb40f5dff5d---81185529361.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/nozuri.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/82679115075.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/80184116691.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/ponikovepomuf.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/bekevusetozirexibiloj.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd4ed2f21b---mebebeposovor.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/3848951949.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c426079f94d---70431186527.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8389a8765---gorepusuwuzorotifitu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be056af290---xilifedogepibusi.pdfIn PDF document text
    • https://ptogel2.com/contents//files/minojizalitid.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a7d097b4d---52045047701.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/23511931350.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kifexigebalobulo.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8ad2e3c9---taruxetaruwuxosezasitewo.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210612191220126.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/57075563050.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/bidibitobiratu.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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 11004 bytes
SHA-256: 90146e5e37956bf6e15a5d62a80370131204b232b9454b3f1e4d82eabccbcdfb
font_02_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 17292 bytes
SHA-256: 18c3fdfd3c7ad1320bc41cce26104788b71c8f315027dc765eb40adb0fb7083a

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