Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ae8e8c7725d219…

MALICIOUS

PDF

96.0 KB Created: 2021-06-27 18:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 487920b1e36489303e47852171743949 SHA-1: a5af52ccce1f1eedd32a6a11e09270514bf54c51 SHA-256: 05ae8e8c7725d219d1ebd8d7d1951f54ede6b1a567a772705eb5714fccc9d2ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atreve.eu/ubezpiecz/obrazy/file/31446610094.pdf In PDF document text
    • http://reutlinger.pl/userfiles/file/2651798085.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607414aef40d5---xikijimalud.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b2d020070---82755174393.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210529233039670741bx329d.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3c380c00---fugomiraliralapuruful.pdfIn PDF document text
    • http://fitviewer.biz/files/file/63061192803.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210625102209.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/zuwudejuno.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801cd3140a---numebafokev.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/nazux.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac25125fe---89382849398.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/vizisilagamuzowifuji.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3caa7ae2901a96aa1d81e3a940c06098/63967739014.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/mogalinorowe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823e0e094f7---febotutokanixasewukodofe.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be724db3ef4---24487985313.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e85a6826870297716b72d9cbfea28704/pupunifarovidazug.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/je9ofv49svimgv2ul2mg3vd2il/dezotezukonamomij.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e3631386---xubawexeku.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/bebawikalos.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9b6a63ad0c53b4887d6dda3e4d48fa85/mupejagegajix.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae47ca0d3---96879607038.pdfIn PDF document text
    • http://industrialdevices.in/uploads/duguresorelimuvanigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=excess+reagent+examplePDF 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_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 10588 bytes
SHA-256: f9c1d28f22e4c29947bbb62bb21b34d4518242e266645955c844739c62a8bf9b
font_02_sfnt_off0001423f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423F 18256 bytes
SHA-256: 570d34f465be2c02808d478f112710503203883c9c916879d6878548bc52af54

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