Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a506d758e072cbd…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 17:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80872f3a8cdc08dc9c86aff4b3c1b5d5 SHA-1: 92c94374481c1d33de33b7d45f76dbe5f364c027 SHA-256: 1a506d758e072cbd727fc2f35ae69b3cf3ddf7dba6c519b4ca97e47c36dd57eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links and the 'link farm' heuristic strongly suggest a redirection or phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137104f5add8---73521630410.pdf In PDF document text
    • http://www.niziointerior.pl/upload/file/gazejafeginukokedoz.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/58567715453.pdfIn PDF document text
    • http://artospace.com/pics/file/61239552680.pdfIn PDF document text
    • https://shevian.com/images/file/memogukotomaxomanujale.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/27283850276.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/finodirekisebevoda.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/k3cl52mrj4ubl25vthnvqufktf/lazunorobidonijubisipadov.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614184842c166---gepuwerexarofavovo.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/bagapubazakejibidoj.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/10166187683.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/punoterudalusubowa.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80e505201---88375953044.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161381db85fd69---salabufixobivebu.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/woreji.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/621714c99adf9c914e3fad5da89a0e5e/tiwuriporagasogejakejanaf.pdfIn PDF document text
    • http://chipgene.com/image/files/20210908_005720.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/dowozajipidetami.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/rored.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/27660237007.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/mifazogi.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/35018728884.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/40848980563.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/majapuwojitaxirupabusa.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210910200328.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/5598417133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gba+pokemon+fire+red+version+for+androidPDF 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_off0000b6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 10852 bytes
SHA-256: 1ea68d295198f7efa1845c8af05020bd87c4ac0ca26603c7e59f9bfd92bec69b
font_02_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 15672 bytes
SHA-256: 814feaa4c375dfbdbd470ab9f4cfca0caaf7ed99003cd86edb9220b4fc10904a

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