Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90aee548427c416…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 12:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 088ab20742971e9c434cb9d174e2afca SHA-1: bf6fb3a0a0b8318fd3d7354d44412416740c52cf SHA-256: f90aee548427c4164aefcd1944de1e1f94a8f5485740b0191425c04c3d75d1a7
164 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. The heuristics suggest it functions as a link farm, directing users to potentially compromised WordPress upload storage and disposable hosting sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely using embedded JavaScript to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4d033bda---vomogirezuxumadarulelimes.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12f666b84b---nagupen.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609757402b57a---67761207604.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe8a55b6e---vemuvewarevadimafib.pdf
    • https://ceccargiurgiu.ro/userfiles/file/lasimorubimufuxibeg.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/43cf231d35b710936eba37f13d0261a6/43998345496.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/642d4780dbf538404b6361843fc27ba7/11568450206.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d3ebbe05f97e987980810fcce47b8fa0/lisoperakarufox.pdf
    • http://banghetretunhien.com/media/ftp/file/gegebixodoxafuvubap.pdf
    • http://brette-animation.com/userfiles/file/78619834297.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5b9696d2---55703795208.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaceb40f1f---78896003481.pdf
    • http://accessiblevehicleservices.com/userfiles/file/80101663398.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bdec2260e525a7eb7fbd9cf12399dc78/koveriwewowuwuwun.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/423054d27106f1e60709a607fa2a8c18/45005114036.pdf
    • http://technestudio.eu/userfiles/files/zizotizomimorufabalesin.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1062ad65c---naxatoxivig.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/12aeebbad6adc17a4ae8576ddf2fd60f/botupubugupaduzemugene.pdf
    • http://ifa-astrologie.de/userfiles/file/55946814681.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rc2gjgv9u7oj796cjt0qoklbf5/45919779906.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbfcd57d8e57921561d45dd07ef38add/zagidurowikulowavilivo.pdf
    • http://chetaomaynganhnhua.com/uploads/files/84928196925.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b14ef491---12357570596.pdf
    • http://primaria-ciocirlia.ro/media/file/8355342760.pdf
    • http://aqbnb.com/uploadfile/file/77109077764.pdf
    • http://makesomenoise.hu/upload/file/36206598300.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=converting+pdf+to+latex+file
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 16792 bytes
font_01_sfnt_off0000ffc0.bin
baf454e2861b3708519dfcc23717d1d04683361d4cb3b9ea7fac8f31d818a7a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 17444 bytes
font_02_sfnt_off00012d0c.bin
132d701482a48ba14d2afcf7cc5935085cffe3f2b38cf0bc3bc5b0ec4ba5789f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 10704 bytes