Malicious PDF — malware analysis report

Static analysis result for SHA-256 c530558fba55cb4b…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 14:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15e6b76e528c92af47632eaf11fa28ef SHA-1: 5202c8d43f590ab17af5420b398a4d202952bccb SHA-256: c530558fba55cb4bfb142df6c1911d0c565dc96e976bcbc51955a8af9ef66eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/36ca98913f57a4090ade74878e6c5d8e/mabekesaf.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0549aa6017---zalalobuvegifosobum.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/716c978605e29383039a6086a8b30cf5/nukilitetemonegekuremoxep.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/oul1290hk9ivbl0v9d4c2c6e66/xeloxebemetoduzude.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7f51510f5---91105341479.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/2s4rvtn73blg3bu0pa7df2h73c/ritedati.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/6csqh138v3tgeqp94qj6j1f5vg/45871908956.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5c79062cd183f39b0f8fd65d63288e8f/tekuvag.pdf
    • http://beveragesgs.com/userfiles/file/lugonomavodepakiluwixilo.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/97271406218.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80c9c5ae8f6c4f2f7e0ac98215f3dc6f/lojixozoninutekofutuzeni.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9ccef2586a61cb69a5434c869bac4d3b/vavusolukumipoxuxipexud.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5396d111fa---fivudite.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/uhb8echiducqs6732248aokt3q/17288522885.pdf
    • https://dudikom.pl/userfiles/file/93668892641.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da8a859b7a---99602824686.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qvkon77jsh9oh42n3a9i8q8sk5/37276993549.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bed87d9da---48597635286.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/13300793844.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8c65f1581c499c649994ff286f74fb55/fodovoluxetum.pdf
    • http://skrabl.pl/www/rpbd/fck/file/12251255508.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c343da41---foteforuwedowuziv.pdf
    • https://oklogistic.lv/upload/file/rutetaxituwudonek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+calculate+molarity+and+molality
    • http://s292376414.onlinehome.fr/datas/imgmail/file/92890483557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16792 bytes
font_01_sfnt_off0001121a.bin
cab728b0b324af71a1719f781be98f1fae171129cb28b595b693a09f86cea42a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10652 bytes
font_02_sfnt_off00012a73.bin
2a3e2833f9ea0466c0829b5aacf02622c935daf9e010932fe40120c45049e8b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 18004 bytes