Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c31be23f8662561…

MALICIOUS

PDF

84.9 KB Created: 2021-08-25 07:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 204df9c568babbd87f1b9b33ce0ab698 SHA-1: 299ebbe382d8631e38b3f0273a18b56d0332400b SHA-256: 4c31be23f86625617b9618590e196d78c1711be9ab12cad0e2227ff2fceae439
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses deceptive language to prompt immediate action, further supporting a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=quiz+questions+for+teachers+with+answers PDF link annotation
    • http://studioingegneriavaragnolo.com/userfiles/files/vizixeg.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/20111196457.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/moridusewoso.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/39162795435.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/sekabatoxupitigenex.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0618a18451---34727219819.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/suxajoxijejevojutuzetup.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/vogipumoxiz.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210718_120349.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/nufavidowutolejuberamemi.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/mujidajuwaf.pdfIn PDF document text
    • http://poorclarescork.ie/images/leletijolanuv.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/h6p87ihd3glbhvldgjv9rk9ktf/favibeli.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/21398150533.pdfIn PDF document text
    • http://huefpdf.org/upload/file/18724292179.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/bagosesujureve.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e233663ce---sudibolufadugig.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/fezodosa.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161081e3f122cc---72807176949.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/duturarumefof.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160923179ad79f---faralelinaxokupozufotide.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c854bf56d5d---bojovumebeb.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4a78657849bd9a7602dd0c3a12e47251/dudabovofu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/85f7f2ff965613494bdcb0c6eb57b597/64299402429.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 17288 bytes
SHA-256: 1bd3385210e501dd2fbc86760f63af3322fcc433c6bae3265df1418aa5ddfc2e
font_01_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 10840 bytes
SHA-256: d084f2d6b720e630360928efc675c503b2b7842761ddb1307c1ad1cf483312e7
font_02_sfnt_off00012df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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