Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2acfacf38daa09…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff6d7ec785dbfeb682c1243cd9f074ce SHA-1: dcd8e8a3f47f3502040a3595b9cf8125d9e4bf98 SHA-256: 1b2acfacf38daa0942da1ae10ef606ed1f2d25ec3e4acd58f411e8e1a1a466a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destination. Although no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence score suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://bem-sa.com/img/file/54888063377.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9ceea231bf597484392f2f12754a2374/bevanawisexitodawu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/gulotusakatosixitox.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/51083478887.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/kutekujirejomi.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gapexiziwew.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5406d3da3c5e7eb774d08b5fde080c64/99741809453.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139913faa9ea---36722746787.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/fozijero.pdfIn PDF document text
    • http://horvathortho.hu/tmp/relodidodeliwanupum.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613357addc710---zusutawiwozemudifin.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/33240502739.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6568291f147344a184caceb3d16fb894/pugigatofipupabugipovuxov.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/joresiba.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/3342920123.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/65919280205.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/18616316335.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7f17040a9896c390a629ae61dde2199d/novobudesotojoxazikig.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/43800009595.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326d8546a3d---dajaxagusavifemuneforimu.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/82764722060.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/dulunenolilo.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/diwikewu.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/sikufowuwofubunaruzapar.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/71281485831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+instagram+apk+latest+version+2020PDF 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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 17608 bytes
SHA-256: 99db417ff2737f293e05bb68a7be12961236d5983a23e7d63430297baa1cecb3
font_01_sfnt_off00010de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 11220 bytes
SHA-256: 0030c5b42db106185424a311043fec2def18ddb799cf684e7cc39082438b5738

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