Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc6628681072bca…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 08:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1eec6357b0cdeab3257b07ccf98935b3 SHA-1: c4d36c51123c2ca95379bce08397f69e8d4b1a40 SHA-256: fcc6628681072bca65179b1564f878a41d32633f77d8b580e4154c0299de6a8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=glenn+doman+dot+cards+pdf PDF link annotation
    • https://aznamaste.com/ckfinder/userfiles/files/juwixudabutetezodeweb.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/95018325061.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/66241450639.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/35070083278.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f94181078baca1b8c306160c7b3aa0b/wefozewisumovajabad.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/82810248894.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/fimejobij.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913151537.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51812414334.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/xixubijukelarawutakuwiko.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/70837773940.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/87870188144.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/raxijor.pdfIn PDF document text
    • https://fitness-base.tw/uploads/files/202109201948547474.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139896af1db2---19029157944.pdfIn PDF document text
    • https://magerp.org/upload/files/zesowaxi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fbgg8jci3sa2tkr6tnnv9s9f79/pupaguri.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/kulonugelopo.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/rusolupemanatutakaduve.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821c8b9508---92828649956.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/xoxarewunazaluropaxalol.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613107888b474---86822534760.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/97255371056.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/kedetekefijerudel.pdfIn PDF document text
    • http://simoncaulkin.com/images/57423226920.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/14175760493.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/radurusaxomupezomifezuk.pdfIn PDF document text
    • 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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 10728 bytes
SHA-256: d770a906abc03cdb8b0a57bdbb52e3fb84c6cc0e0a462ab0355b26fa665b92f8
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 19464 bytes
SHA-256: 2e72c1db174530a4627f41fc963281db25094a5aa8828e6ea011a690e3ed3025
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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