Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4aab1737a66f6f8…

MALICIOUS

PDF

77.5 KB Created: 2021-08-22 03:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b1977be2cc7aca95d52b58d2df74359 SHA-1: 86638656015bff3a52708866d53a53c46b6af315 SHA-256: a4aab1737a66f6f85e4e2620c019c53645b3670c153e11ff51b7cf2096d53976
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://charterfori.ir/basefile/charterforiir/files/63765178779.pdf In PDF document text
    • https://capitalsyndic.com/userfiles/file/mizolido.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gebelezixuzegun.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f3ec7f6eca24cb554036ce2d8724a029/mikuzevasulibiwujileset.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/jeraxetozupewiti.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac285018bb---63294048177.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c9e1caf89e5d06b4bc4434ffb8f1b26d/ponigewojetojarikarejonu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05r35i1eso2m9g6uq9171t9at5/24930229242.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/72653211102.pdfIn PDF document text
    • http://ssp.by/var/upload/xaregusovukatotonejo.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/66229135180.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/24696061024.pdfIn PDF document text
    • http://cocoal.com/uploads/file/niwagapagarasipamupadif.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a88d560dad2e42a3c38f1f153424202a/wolanufumuzigokagafe.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/jtqlpno8te86kvije0e3qk6dpo/43290204241.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/58418064172.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/34b80fdd39990c0b39c97f1aff7307ea/gebutesavetigu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/80432741272.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665fbc80f1---53899901264.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210714_619D95C7D39C9891.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497dba961a---kepifut.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c179a9ec52ef9421ed2b0f769b797eac/mivezegofuni.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/60574408691.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c87aa1c797c---5476967860.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/65886244944.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/594a8e67e5a871f50e92371cd2b7f41f/wuzifavovoposarememepebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=9.s%C4%B1n%C4%B1f+denklem+ve+e%C5%9Fitsizlikler+%C3%A7%C3%B6z%C3%BCml%C3%BC+sorular+k%C4%B1saPDF 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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 19684 bytes
SHA-256: 7cb5e766596853af3ed2ce1542f8f53c44a3ba78dfcba67d485a464db5d04268
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 11860 bytes
SHA-256: 617bf1561cc0f63963b81699ee4456049e748f9465c38cbc5082c8bb4a0fc31d
font_02_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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