Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f443aeaba5062b9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 09:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eff94433be07b745abd468b9d1ff043c SHA-1: 61da0af42c9f2712bda63cc930448bbd0d3cc64a SHA-256: 4f443aeaba5062b985a292c2aea399f4a7f9c92fe42fa259528c8d631ac7e303
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malware. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevamevogogejalapapadaxo.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161312ab8bd1a1---wujikijadisafogagarew.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/73744606877.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/13453711785.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/toxiwofaluzud.pdfIn PDF document text
    • https://digireg.dk/upload/90865852121.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/777367f7c87dcbe444b744bc6f44dfe2/68349063868.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109120118241184.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4f91noja152cvkv5dr0trqt0a9/41773979883.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/lumorososopar.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/19103594578.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/58939410628.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/9597938776.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/jewutikixugajil.pdfIn PDF document text
    • https://apelhijau.com/contents/files/pavul.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e46747505e---41816915510.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/kujigewagiriz.pdfIn PDF document text
    • http://mq-water.net/upload/wetepumuv.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/87984245483.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/104718380.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/20883400882.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/50da1feef838b4d34815ddf97d63ab08/27310919219.pdfIn PDF document text
    • http://livestocktool.com/d/files/24408453431.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9c4b43e20db85e7036ae90a01be8b85b/xosidaxanemonezurog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=play+geh+tv+2020+apk+iosPDF 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_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 18472 bytes
SHA-256: f2206e2bc564414b84aa1bece1ff7133608d548ffc9c4b8cc10d96f00d5f3501
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 10844 bytes
SHA-256: b46ccc51dd653d061fe2b37bd93f2912dd9aea988f5b8c3954a12ee6a3ccbf7b
font_02_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1