Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e9a303ef6ea2ec…

MALICIOUS

PDF

82.0 KB Created: 2021-06-26 12:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db7aa7ea3f925ca516e5cfff438151e7 SHA-1: 4a0eef8a67a1d2fd1355e062f9990c02c3bfdc0a SHA-256: c4e9a303ef6ea2ecc6e37f58a3177d656658b852fb0c52ea3d891d67a3bd119d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://jagodkaprzedszkole.pl/userfiles/file/mopatetorudo.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf73094971---fasodevoma.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160837262c82f9---kosutesetatisasugewukar.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fhibj9np67jfd0019i9fdim9j5/72894940767.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b805b41dcf46aefeb7841a411fb12030/94408600933.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19ae0040b4---lolirabadevadolupupi.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e45662542c62b38b71fb19fb8a2b8e9d/45808301491.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7b2b7346f---wivirumuxa.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ffed28a81502f78d78edad2a81675794/mamomukufupiwufes.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da32f46248---49825681469.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac8fad678---wepizeboxibego.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a97db046de2---41694843763.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/59576265187.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb2539526---47196849739.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/41c863501c940a026174dbd99dbca2d7/fusawa.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca38ec87b---wemenesepuxu.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a208de2aed8---24865150746.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fm1r8clv6bql1d8fpmdbia89bh/78778252176.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd3b5412a---88860832215.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4d730201390ef4af8188489a599bb85/86164548705.pdf
    • http://sushiosushi.com/uploads/files/96361140287.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/af2fb87f23b05b5daf78ccd7fc1605f2/79649272010.pdf
    • http://samnakthodrahassob.com/userfiles/file/gopes.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/kejuzapanetugujudese.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=davidson+county+general+sessions+forms
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/04947ba8d8792790c3b21e8c7043d8fc/91297490982.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_off0000d6b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 16792 bytes
font_01_sfnt_off0000eed0.bin
8de9461354dd5d72ef056b6a85cf70c30589806e6ffb171d195c4f2247cce16c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 11100 bytes
font_02_sfnt_off0001088c.bin
b75afbfa9737f2f2996ebb7f2f72b57218141507157ea4a53d7063d4faa4a225
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 18424 bytes