Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9912298291c813…

MALICIOUS

PDF

91.0 KB Created: 2021-08-10 21:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a3b3662cbde63117bb7c928424a435f SHA-1: abe3f030fddf7119376cdd6c96cea06961430881 SHA-256: 2d9912298291c813c9def76066a07211664b12efe17aeeab092901784b855425
164 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised websites, some of which are specifically identified as compromised CMS uploads. The presence of a 'download' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.saito-ken.jp/userdata/file/fenuruledonisixoka.pdf In PDF document text
    • http://hanasushi6.com/uploads/files/lurunanidopebovunizix.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/47934191296.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6b58c28d6422b735c72e5351dcf13879/5898764619.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/kobezoxaw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe883d14bd1---vuwis.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/gexubituvate.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/52273836261.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f2115719fa0aa50683d26a1a675f0b79/33239038014.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ef78049f4---34918535326.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/84530318342.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/71886067522.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/89810710728.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/71311855277.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8403908f2f---lijevanexonipudiso.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a6101164ea5a903fcf763b09478aae06/50495907888.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/luzenamajosato.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/607795bd15dd0eeb777bc9ccf1837c3c/ledalimukomarako.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/49749234094.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/miropakubedimi.pdfIn PDF document text
    • http://jaqalsports.com/files/file/21957141497.pdfIn PDF document text
    • http://cga82.com/admin/File/mavekidife.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/69861433435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+left+4+dead+2+android+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_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 17020 bytes
SHA-256: 74200909f2b0df02fd09fe28128b77722b5bea4e1ac1a3f3504cee0509f794da
font_01_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 10868 bytes
SHA-256: e534557f0fd48340a5916cfc45fad613ff460a9ba36397a828aef2cae6931cb6
font_02_sfnt_off000144ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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