Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7758dee0b7ac79…

MALICIOUS

PDF

76.0 KB Created: 2021-10-05 20:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 013d0bf7b7d70a82a56633cdcc5b1481 SHA-1: 20731948ab807098985e0e8415e5491d34cd061f SHA-256: dd7758dee0b7ac79230fede3cd53b24e95d7dc032a5c62450a88693e0aaaf63a
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The presence of raw IP addresses and links to CMS upload directories further suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • 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://dewalt-naradi.cz/media/upload/editor/file/94273970741.pdf In PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/59811955943.pdfIn PDF document text
    • http://hkwwta.org/userfiles/fenugix.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20211001_064901.pdfPDF link annotation
    • http://hstechno.com/userData/ebizro_board/file/72310586026.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/najuxexesizusivemetug.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/banekelo.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/88400303438.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbe9dc994---zufomukazekivesa.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210924021144.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/8129930602.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbe6df51f---78670515002.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/sedavokuxodexazopixad.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/36859110442.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/18074326312.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/41567672505.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/pisigab.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/95068573449.pdfIn PDF document text
    • http://labradory.pl/file/62469994876.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wenaru.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mevukozigeparogaziratelaj.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tetaxoronosimafepizu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/57829503435.pdfIn PDF document text
    • https://pecintajp.com/contents/files/7631293133.pdfIn PDF document text
    • http://gojjang.com/uploads/files/51503961588.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/62h23ami37ue5mobktcbuurpao/xijetu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0a0f0babec0e734a4a8821d537d9d714/nonelumekino.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161590e264104e---45910919738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=autocratic+leaders+todayPDF 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_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16116 bytes
SHA-256: 8a28f687476d71c02e192b61d0365a53097118bc02afa565c220787c598d96b7
font_02_sfnt_off00010a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 10452 bytes
SHA-256: b0f508174040e9832b5a091e78671addd25a59843552358b32303e5ccb1bf835