Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ce46445b05c203…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 12:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd25719134fff426f5b64aac8116f135 SHA-1: e0238292a509b762a0337f59e0c61d1e6944c1ab SHA-256: f4ce46445b05c20314a627e2666b3cc7abf25cf484a703748ca8048751e97f35
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information. Numerous URLs are present, many pointing to potentially compromised or disposable hosting, suggesting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://flapboxes.com/userfiles/files/74749667308.pdf In PDF document text
    • https://rotitelor.com/contents/files/53995368434.pdfIn PDF document text
    • http://poultech.net/d/files/texapasimidunovuxifojufo.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/11587877803.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/kunojiwizezasudinaror.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/kefopiwoja.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1418cf9---petiwovapemanukusasaxogag.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xonafobajug.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/22810140639.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/412be71c35a0cfc9ba1b425a270705c2/xekujer.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021917847573058.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b042830b---zodudiberim.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/38c094ff93a6f4b9defef67d5f0d60b5/14135616892.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/sazenesavevu.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210917154830_3s1yt9.pdfIn PDF document text
    • http://classoft.ro/userfiles/file/wagubug.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/57959274903.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613554b2892ca---14798223502.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/41141508521.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/91370917766.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/bupelapawajokesukulej.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/88675331806.pdfIn PDF document text
    • https://hoavily.com/uploads/files/10566956364.pdfIn PDF document text
    • http://langyupharm.com/upload/files/zoradivinigorikalidafa.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/84602214165.pdfIn PDF document text
    • https://arendic.cl/files/67800831215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=iso+file+free+download+for+windows+7PDF 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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 10336 bytes
SHA-256: 4ebf7f8124ee2bffcf3e61c35da3185f8fa278809dfe8c2b109624295005599a
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 16460 bytes
SHA-256: 374c721c800281d8ea95f70c253e869786fbd40d70aaa2f953cfc3689c537342