Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8df8d8ec8aec25…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 16:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57d8a659ea78a7d38bbe3e9dd5c1fc2b SHA-1: 922df96395e6a514f856cb11ebe652d5b19a68a7 SHA-256: ab8df8d8ec8aec258890d1ea40bfc09f4f53a94334046da1effd60ac76487b56
196 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=postgresql+11.2+documentation+pdf PDF link annotation
    • http://championshipsportsrings.com/clients/23492/File/nemalikozawawofatuduk.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/87124179418.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/jireworemibuzosul.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dawuwosiworivusisidivok.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/65594885156.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/pipizor.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/59059052184.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dinifegunam.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f2700b40---pabuvexadapaju.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/48806105920.pdfIn PDF document text
    • http://africareview.in/userfiles/file/91995343054.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0cc82c2f49fcbeab27f5adaa9341d2a5/badomixalunemig.pdfIn PDF document text
    • https://777mto.com/contents//files/tesofimededebinopigabipij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a53667952---90168351135.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160809640b740c---pewojunuso.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cmjla695bfd6st3oogru8u7722/zikili.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/xasukodamidufoz.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/28650910483.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/72556735081.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bk399ipd2ut5ja2o4n0tjsn6e4/valamuga.pdfIn PDF document text
    • http://livestocktool.com/d/files/foxotijul.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfe21894d---sunuvasipifumad.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/23746197763.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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 17312 bytes
SHA-256: 900d27764d6763caa5aee3e7d5cb532c66c997b672adbd318ca01e2beab463cc
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 11448 bytes
SHA-256: 62fa0c2f22637b20c4e546912221f73c56b53ad06914bb06dcc00d04df251f04

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