Malicious PDF — malware analysis report

Static analysis result for SHA-256 f170c11090e079ca…

MALICIOUS

PDF

77.5 KB Created: 2021-08-22 04:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6e661f664e8a2157b2321cc8b5ba2be SHA-1: 15ea0c1716702b767da2d945134cf39148b3bbbb SHA-256: f170c11090e079ca80841a27f11b633b640ddd93376ee0d3cb5d61a4b3b90df4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links and the overall detection profile strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eaf00154ba63392c0ea03d1883003290/pitenadakadonikarogu.pdf In PDF document text
    • https://smobiil.eu/userfiles/files/70931655490.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8b9e5a1c---93548243359.pdfIn PDF document text
    • http://erex.hu/upload/file/5436677071.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/61uk6038ucp8pthgcbdoef5eok/dizufetub.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1gslveahshvvu2nesqpgnv8i37/buxonuvul.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ee1f3559---21614242750.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/70a86cbe7fbfc3199fa7449ef37da277/jonisekajetosopejimoxedo.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/worogudubuluzu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7dcccf2a---wamilexowakepadupesagatul.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/t1bnims707mq26lu933dcfghdq/jakegukomugepug.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/solisuluw.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e250a0e76a21fd01e31b4f3288f31664/29299616800.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zufipugawofemoniwafesam.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/numakovuxabit.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ufutoluzowegova.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4980ac37004c162e747cc2a74ff17081/pedapigezixemakixubozebo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ad242e52---ravom.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/672554595.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f7ea8f812b997485a686b59691ec6bca/kajipelajosefitawogom.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gevogegivawuvegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pirates+of+the+caribbean+full+movie+in+tamilyogiPDF 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_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 11204 bytes
SHA-256: 18546a9d3ac7c7b66b141f1f68787237a5431c2028774268bf652f06b596d28a
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 15980 bytes
SHA-256: 7f3522cd5c925e61870668a0136ff1b80f1d8d85e1e0b4835252d15018db0ff7
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1