Malicious PDF — malware analysis report

Static analysis result for SHA-256 5584805a538d0714…

MALICIOUS

PDF

90.1 KB Created: 2021-07-04 21:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01c55f86c0d86072d6bdeae004a26510 SHA-1: f1e963c0fefd060f8a9f560fc75ff7ada8cd3358 SHA-256: 5584805a538d0714e0154dd93ad38da8024cb67b912d7b4c4c044aa4b52a7c34
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb142288e3---92359208653.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fi2emc33kb3f2m1kfk199bad11/13749199326.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5375a20e3---disuwewavogijetolinubad.pdf
    • http://mtsskzy.com/userfiles/file/90506499828.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0lip9gd7i5sfktmijfm0k7kj66/natosipideror.pdf
    • http://hud101.vn/webroot/img/posts/files/lisedet.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d28b13d68b6a21ca19b4f75dddaf846/zoxodonojorexamew.pdf
    • http://sevoir.hu/uploads/file/4949351905.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bda1ae1f7802bf9b43a57bbb28e8dac7/bozozuzagejezulir.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085780043d64---53878929718.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/18hgh3tieitennqkaf5chtkflv/6854381442.pdf
    • http://skikk.nl/app/webroot/files/userfiles/files/joponiwaxoxe.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea71dabf54---83172858206.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ahmj0jskad6v75kpibjubjlo64/jusebudoboriziwuj.pdf
    • http://lamdecal.com/Images_upload/files/xesusunewe.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rpapunm65m2inb1o1fsbbokb86/54750550912.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076652cd92dc---filofo.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d3dc5adb87f750326e2a96cabbdd9d84/70800728523.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2866686851---pefarosopuwidoteju.pdf
    • http://botosani.ro/img/uploads/file/2128916125.pdf
    • https://brahmagnanam.org/fck_uploads/file/liseb.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a138ca30---4977363225.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab55964e5c1---27472431610.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/36f609ee53fe45f0f522c8d281a906f5/93629353508.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sexy+video+tamil+live
    • 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_off0000fd9c.bin
d098e7de7683a9270cc2ab2459748ba440c5e380872b55ceb9148c7766944275
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 17168 bytes
font_01_sfnt_off00012a0f.bin
87492ce8f949e1b6d9fc87306589ef26cd966cbdbdfb49f006de34ff4f2866c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 10396 bytes
font_02_sfnt_off000141ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 16792 bytes