Malicious PDF — malware analysis report

Static analysis result for SHA-256 625747366c3b0921…

MALICIOUS

PDF

196.6 KB Created: 2021-09-01 14:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c1f68fbfe8ff60c1aaf60ef9f1c300fd SHA-1: 8ffd6542cedd506e38b26407bcb621758c6eb63d SHA-256: 625747366c3b0921a5b61ff158e6fbfe283dc34e57f78313df0a5db7e013ab20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. The document contains a link farm that points to multiple PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or lead users to phishing pages. No scripts were extracted, but the presence of multiple external links indicates a likely multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9458

Heuristics 5

  • 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.
  • 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://obermeyer-modemarkt.de/upload/file/42535105703.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/49cc250b72ebc58cea0e66d356f0eca5/vasibedakovit.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/5a30e6048fd7773e9afe40e709f76acd/dugadezuxaguvupu.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/lukokasonawobetito.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f1necsmvmi0d62jmk3hq0uj994/nejetasod.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/85793287433.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/xilezutuf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc54671868---75440749316.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b554b10a7c7---92310160818.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4rq8he7pbmp162llajfbeknfc1/gopimawomisimevotubileg.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/nojivonurenetakekifo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ec60bbb4---zikelevuvevusow.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/khg7106n1mt9uki8ibn6k0i4s1/wuvewedinulamawakewixi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210703150025267.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/57696309181.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/wubefusepololoravajazomuw.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/88594800559.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b213a2e0c---46563986305.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608549d7403d9---3665448222.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/379c11e7fae5ac4f2e71427446db07bc/renoninavemade.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb49c459fe4---sosemugakuxezigilaze.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/givufitezitowugu.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/24208400541.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/kofumizerewopulakejuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=he+has+loved+us+with+an+everlasting+lovePDF 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_off000293b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293B8 24092 bytes
SHA-256: b75cf0600f073bac6d08af98982a64f2652c33228285020780b4a74cf71d5e20
font_01_sfnt_off0002d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D04A 10772 bytes
SHA-256: 2a7fcfcc253aa1035bc582f071fc3e09dcc4d265102ce9766dab568592334899
font_02_sfnt_off0002e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1