Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8a916bdf1aeea6…

MALICIOUS

PDF

86.7 KB Created: 2021-07-30 16:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 387038f7ea9bd1fd97ff85840415b541 SHA-1: a88998822805195ed4199fd79d5793308857b305 SHA-256: fe8a916bdf1aeea62975d6303df95ad5c93f5c66aae49cd4576ffc880e15cff4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content. The presence of embedded URLs and the 'download button' heuristic indicate a lure to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • 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 http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/digevogizad.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dea80e205---golexibavixepugitidasalov.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ff14b1aeaf39bd2223664f0e04ff55c0/48892351276.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/89869989488.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15337e30b---kelififinipowofidoj.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/vaxifaninuw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f00adffc---rexonafadogoxevopafal.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/81191439390.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/10114847482.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/73928933539.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/ab847ead0c24b4fd694efc01f35d593d/volulaxamilike.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/90f356644916aa7398786f56219bb178/gukevimesobubemapetizipu.pdfIn PDF document text
    • http://plainsailing.de/i/userfiles/files/18568872811.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gulevetetuweginajab.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/dukapexedipifixuxuses.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b62698354---vowovudituduto.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wuzinugivabox.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/ripoduvabuxa.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792686c5d6a---taxavaxikelapoweg.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/46756083002.pdfIn PDF document text
    • https://activepymes.com/pub/file/34306837139.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/22204070947.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ec80d307fede2c06dd09ca1b66857a97/dazadigogasekowe.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/50969611550.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/67711103328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=telugu+novels+pdf+download+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 17652 bytes
SHA-256: 7f138ff4aaa2999c5ede1538ed1b7445995a18f5c985951a88b66323106be2b7
font_01_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 10696 bytes
SHA-256: 5c56ea6cf9ef658382f7a6d5fe6f7bcd081f1edfa3b367391e94f502d76a74ac
font_03_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd