Malicious PDF — malware analysis report

Static analysis result for SHA-256 2faad77c380b7dd1…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 07:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dff43d0028eef0e320eb58be5959e118 SHA-1: cb73e21c91d16c7815b59259e9c85143e7af281c SHA-256: 2faad77c380b7dd120bf04330aae78d6ed6848f02d96658a1f1cd72405bb06c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable hosting sites, with one URL specifically mentioning 'mod apk', suggesting a lure for potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://nomylo.ru/uplcv?utm_term=surgeon+simulator+mod+apk PDF link annotation
    • https://smartcrm.cloud/upload/files/72943773699.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1728daa60---pefekagebubifosijibi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5eef092a---68377430600.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140081c584d3---mupokafituwejatitof.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4gjk6nd01t1594n7f82vbdpnna/kuwan.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/vutadisiruxok.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/47719093467.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/rafulebovaxezofojasoxadin.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147d3ea76dc3---wojegolepokuxobina.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/3680913065.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da426b9ce---74023796618.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/dologana.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145463f402d7---98012895074.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/30828282546.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/69178679258.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/34560036542.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/guzotudisexexezosigizi.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/90478012024.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/kosevexa.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/deratisone.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/zamipabamumepizikupuvabat.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/pokusela.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/fonatatup.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/66553325203.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/88213093476.pdfIn PDF document text
    • 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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 11004 bytes
SHA-256: 8409829496e3c519bb2310fdc7e9101ef72403c43b75ad4e243560dee5813f50
font_01_sfnt_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 15116 bytes
SHA-256: cc465b63a8abc2d506d836bf19e13265e4d99557abb26b134e63e9a2cbce9cf3
font_02_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1