Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a550e5d83d6535f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 19:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a42c69e3abbcc44d271e3fa2cea71b53 SHA-1: 2051a50a527dc7696f878bea9c20b5a1786e0b58 SHA-256: 0a550e5d83d6535f8e58b34d14448906a550d3238e9f2106162e9c255fcc4bb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=blaq+diamond+summeryomuthi PDF link annotation
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315ecda0b87---wegom.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ceece9430908686e74eb5d56c2bfd765/givinofagaxeserijuzulexem.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/13325830636.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/tuzetu.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/bisejasomudeg.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-10/20210910045636425720.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dacd0ac3---napikugatonozajorogewed.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/72952246447.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614104d910ded---tugidabefi.pdfIn PDF document text
    • http://adice-area.com/pictures/files/wozadanamadedokapiju.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/viwikisivut.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/44755106416.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/42036727097.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140136855bcc---fugokoletejetugipojisoji.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11641476a---sanogufaratazavujupi.pdfIn PDF document text
    • https://zzwgjx.com/d/files/62943969693.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/jawosow.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/88149816161.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/99764651105.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/80940352110.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/kulawupafe.pdfIn PDF document text
    • https://wonkingchina.com/d/files/kepexudapavoxebavuwove.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/28613040254.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_off0000bc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 16456 bytes
SHA-256: b6f53f2ec140b99a04e8f6fed766f57aab5edf23166fa02d8965e9ac71eb4e57
font_02_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10928 bytes
SHA-256: f4ca0275f146b0961eeede1bd816d2d220f624e8d92cc4b4b0f4a3714a52e932

Open this report in the interactive analyzer, or submit your own file for analysis.