Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c095063da17d9a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 16:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a854638f4021afe62bc857f383a20aa SHA-1: 30139e0c0b5ece25a2a2c09063ecc1a353d79bce SHA-256: f1c095063da17d9a56d10120ae8427d0455cea649960268a4bf62ac14ac1118e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pensiuneavalentina.ro/app/webroot/file/2499264042.pdf In PDF document text
    • https://haidangpc.com/contents/files/8338943924.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/58924318537.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/38039579983.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/nusatikuxu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/682e938774787a3ebea54d9bfb3fc3e3/laxiximutifi.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/83488365465.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/28097559592.pdfIn PDF document text
    • http://ridendo.cz/files/file/lajopusoxinomiwedalomo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/37720400656.pdfIn PDF document text
    • http://orthodoxnews.us/file/36358104072.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/27009438265.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c590272e20a---47736336972.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/gulirilidabagiwil.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabeb31533---liloxibigapega.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/duvavewikazedamekowodi.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/gomofivom.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/78599670801.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38e031789b---vaduket.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ib6mkdfakrs1d5ss3u6s7bgdp7/samifinol.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/tivofugiduwitadiwuzox.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mhnjos754h2odsfc1f7q3kt9d2/97098603391.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108201354465635.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdbdc0d15d7165465a0aeecd4a299/16362480736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=muji+diffuser+user+manualPDF 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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 10520 bytes
SHA-256: b9cd4f2396812efc1f0193905cf0802afc0c19c3c27cb5c26daffed5c4559170
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 17920 bytes
SHA-256: ab5582deb86b6a82b99308b05616ba174b092b0a78abdd8b089b208d844e234f
font_02_sfnt_off00012d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1