Malicious PDF — malware analysis report

Static analysis result for SHA-256 955494528978f66b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 12:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14627f5239c05e768afb262c26a87dfa SHA-1: 2495e612ce437a854de77a22a77e7bc14665291b SHA-256: 955494528978f66b1d18efa695fe5206fa1b3207fc5eb7194bd28d418845c299
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=pdf+to+word+converter+with+password PDF link annotation
    • http://www.rajpuc.pl/pics/file/26065656656.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gdbuucftebrrj9bfgonq2cv2g1/pitixekolo.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/pulekigexerupivo.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/49344486146.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/872b30ef80cf8a7f3411a137f3459eb8/gijexarub.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/20689839759.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/pekedosabijopuxudejasu.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/bapuza.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/sivapebisizokupixezopobeg.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/juwowawujex.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0hjpn6bi9nn53sad211g6g36qd/31445619699.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/rumapun.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/8639219417.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/77450583921.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/51541017162.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/vutodilaladuwokidejivamex.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd782a8643---85440438729.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boboj.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/zabikapujogubovevu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161322aac200e5---ratowaboro.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gasodadivukatose.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/31793140394.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/22717150039.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/21555254786.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/difilatodinisoruboxari.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_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 10824 bytes
SHA-256: ba2bc3c407c12d9156f37a477bd524c305b15f3ced3451909807ad2e6f2302d3
font_01_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 17400 bytes
SHA-256: 232336950efbe3773c7fabfcd2ff5a968f9802cee0afc0204c6ab55e4e2488c4

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