Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b70f07f6d7aabf…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 19:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 224a80d9d695e67fe1e8d8be53d22191 SHA-1: 3a6f062b02cba8b4a90a78f96fcb74b6eda59aa2 SHA-256: 92b70f07f6d7aabf1272e012cd47a9e184f1885d6cf126874e16ff2ed75c2e66
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://thingsantiquesla.com/userfiles/files/24858779244.pdf In PDF document text
    • https://francemonde.news/UserFiles/file/gurakosimiwavavupudoka.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b761dd547f---49305795292.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/36498247321.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210917004726.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334c020a94c---tinojifoxalenufo.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/56832755130.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/61100718021.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/2728165326.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8fcefd5f5556a46f8501f7ac610ab2f5/depopanudoduraxaj.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/72961840127.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tedopivuge.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/rebibovimumobunas.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/megafujebosuget.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jowilawovodol.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/zujugaxaveg.pdfIn PDF document text
    • http://vhshf.de/File/12995851265.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373ac74636e---63720337165.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/38654748717.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/pawipevowasewiwinar.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/fobolawefe.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/76563872048.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/20555558562.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/10214799334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+scan+a+code+iphonePDF 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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 15980 bytes
SHA-256: 785d605eb1c644bac9050331eb8bb40e04a006c4f706950070c620795ac53e58
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 10540 bytes
SHA-256: 15b350b4ba682a767c425738ae228a0c53eaf783a7ea81e10255964403897e20