Malicious PDF — malware analysis report

Static analysis result for SHA-256 d682cffd37d304a8…

MALICIOUS

PDF

88.8 KB Created: 2021-09-20 05:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 50eb5d31e399c1c6c5e69b2f142f1b5d SHA-1: aa559df199d854f9208585dc41b029fbb2bd1a8d SHA-256: d682cffd37d304a805f3683c72bdb237aa8cd0d9166596899b961c4ed93dcf35
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, so the primary attack vector appears to be social engineering via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://canxetaidientu.com/images/file/23939239497.pdf In PDF document text
    • http://hagelkonzept.de/userfiles/file/pedotex.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jiporeletudokidaxoj.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/99932167641.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/88346947718.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/potudemadilifebafi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16145ae4169568---jimoguxigilo.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/xijujimuzi.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/31253364957.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/3340484739.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • http://teknis.it/userfiles/files/65589688129.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/74907481178.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e1adc59b---votuvesoxirire.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/40331341822.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/66709045347.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wofulewefubigipise.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/17562419752.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/18179297905.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/xebixukudesusebigetulanu.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/80610255488.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a655d7c9---fimunurozazadik.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/potipuwomavisi.pdfIn PDF document text
    • http://megalaserasia.com/upload///54091220519.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bimuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gg+hack+mod+apkPDF 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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 21076 bytes
SHA-256: 5619c896d40f8f874df34fff127e92e7f997ecfaa117e37e3701d9506bc83e8f
font_01_sfnt_off00012633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12633 10352 bytes
SHA-256: a7ee6a126b4db94e7ab366d552db36c555288190c60f054e9eed4038978ca514
font_02_sfnt_off00013d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1