Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5cf7ad17779267…

MALICIOUS

PDF

94.0 KB Created: 2021-07-13 23:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89870f672c9ffffb31a1a39aaef0fe04 SHA-1: 02a2b9d987f0005e1ca5228f6941a99249d575b7 SHA-256: 1e5cf7ad17779267973113368f26e6c125356ab6726f8a417d39e8da49a2dcb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • 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.
  • 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://www.emailposte.com/pictures/buvewi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/71061a7913ad363c6784a24cec57d379/69981570645.pdf
    • http://farmaciacogliate.it/userfiles/files/56286770752.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/wakomuxodugoburoju.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6e4ba357da4d52b24e30e137a7fbd83b/tegabusomijefurebi.pdf
    • http://buergerforum-tirol.at/file/vagilavajo.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a607e61aaeb---teliminukidikopiv.pdf
    • https://path.mn/userfiles/files/27377116856.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a1f18452d80a580ac6dd2ff0d1d3f6f3/gatalez.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a55d2738b---demisobuja.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc8a4042f---tunemademiwabotitan.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce798de1e1---16540026008.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c963aae9b4f---rajasijikutikirepuguwegar.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa02ac7dab4fd2408307641711a878d5/37379713029.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/23437448803.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cea947ababb3f1ae1063e91fbbbeb70d/72695948561.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/90073884598.pdf
    • http://maychamsocda.vn/images/userfiles/file/kimijazo.pdf
    • http://wildpflanzen-planung.de/file/75993200083.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/89731bf9746165cea098cc6144f1ca8d/80417775525.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/tugebozumufupixon.pdf
    • http://apricomm.com/userData/board/file/jukado.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vidmate+2014+free+download
    • http://janyska.home.pl/_mjanyska2013/fotki/file/jodafasip.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee55.bin
ba45563745cfa196c458e327a01b9c3c7ee49e236ee31e902ffd1c89576c1025
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 20200 bytes
font_01_sfnt_off000121ff.bin
b9ca7010927ba6654b24ad16a089e8eff524504c2562ce5386ca7ea9e76c8231
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 10772 bytes
font_02_sfnt_off00013ae3.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 16140 bytes
font_03_sfnt_off0001505f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1505F 16792 bytes