Malicious PDF — malware analysis report

Static analysis result for SHA-256 98aa8942f43f4ac4…

MALICIOUS

PDF

80.3 KB Created: 2021-08-29 12:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec166b1f5a95affde84a7d100d629bb8 SHA-1: 473e2a4776f92dba39330ec376c2009221b29d5e SHA-256: 98aa8942f43f4ac4897b03d31fa6b12ecb394597b12cac0cd5a36e105d1c0de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL targets are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://kameleonhastanc.hu/files/file/78138041765.pdf In PDF document text
    • https://kanat.com/upload/ckfinder/files/zonixaz.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/83073959543.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b6f93f48---sitesosisezerowerobewuk.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/88a7daec83bb79751a7d963e823726a1/wogukux.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc46cca3555---84267949068.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/35951459230.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/20424764120.pdfIn PDF document text
    • http://ubest.ru/images/file/fibajazopukululed.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/63768147332.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/luketivuwokinu.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/kopivevafimidugivitisar.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rugerafekufuxudokumisaver.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625278382.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64d27086fd---63697591514.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/32386416027.pdfIn PDF document text
    • http://huiking.cn/uploads/file/070241113990.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rmr78qcf2vhkv4rdtplkmj8jh9/sexifopilivukasegelatar.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb600921a0---rezanusetasogaj.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/707d4895557b5caa675af32448026bb2/5676589412.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0e78c3f31794e6ae7412e37e8610334a/20294570807.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160867564c49df---xitenuvazisadujeso.pdfIn PDF document text
    • http://co-mit.com/uploads/files/verarorozilotat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ffxiv+fishing+locations+by+levelPDF 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 10912 bytes
SHA-256: 8653ce577d01c4a5be8d3faa0e590254fa0565093929ecbe15b56dce66d85fc5
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 17248 bytes
SHA-256: e77c8e7edfe5c4c2cdb491313f61c382a91224d38378fe0f7314f2f21fa7125d
font_02_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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