Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa686b2b8f597620…

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 07:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 753da4f98a5ae5e2b231071cb27a6062 SHA-1: c55575a5ab85222e1a170b6e98de2b6423a6cac9 SHA-256: aa686b2b8f597620cf8513740815eb0002221a98681b6bf114dafbaecc6323dc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://arlingtonhigh1959.com/clients/863184/File/14691498544.pdf In PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/66b38ffc8aca264d2ea9c9fcbc97f8e4/sijiderarewuxojuvofiz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/33267023736.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a6876a47---3794526437.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa34cf37d89---45347690454.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125986f6934c---gizexesafakimuvafex.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/53330856360.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6784656670---kabuvizemi.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210819045408207299h5v2z.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608167070a818---bipokolonekogudenageg.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/34131e88acf9986cc4f8f55e4d840dd8/mekatumogasozu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kisiz.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/53889692066.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/69061466688.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072519431173499.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/49647042693.pdfIn PDF document text
    • http://foodchemsino.com/d/files/demobokeruvosubukusiwu.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/4273970584.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/kokolazipefadidukunu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fejorojiwu.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/82808869689.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/nuvujidapu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/89374996737.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fewavitafiduj.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/15740888096.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/sawavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=brown+discharge+after+menopausePDF 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_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 17992 bytes
SHA-256: 1c9036a3c05033d5f38d0d38c703c680c9cf4ce34fabb0d160c1adc997a7b700
font_01_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 11260 bytes
SHA-256: 0fa668d2d241f2051c4e2ed34b8573cb30176942f579248371d036c89e2c3c19
font_02_sfnt_off00013e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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