Malicious PDF — malware analysis report

Static analysis result for SHA-256 3839318a3623a8d4…

MALICIOUS

PDF

103.0 KB Created: 2021-06-26 00:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64fe88421f52d2f15b922462b32a113e SHA-1: b8a9f6db50f90a0edd561b3952ed7d352f9e4d6f SHA-256: 3839318a3623a8d489bfe066c6a13cf9b12404396527dd91f96da43e7a18d957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, suggesting an intent to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious infrastructure. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://allytemp.ru/uplcv?utm_term=can+you+use+wii+controller+for+gamecube+games
    • http://andrelandberg.com/userfiles/file/12076001775.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1192540432---devezetakamuvekesemetev.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a453daf639339463b9fcf8309afd9e03/lunev.pdf
    • http://akcjonariusz.com/UserFiles/file/lubibiratiruzoselanubag.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2cad2a38---baguvow.pdf
    • http://pspectr.ru/userfiles/file/3301932758.pdf
    • https://agrimal.pl/userfiles/file/fofutafojuwoz.pdf
    • http://wallawallahighschool1968.org/clients/75819/File/58368085479.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c875ecc0d7---nobirimadidalegetafiwokis.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210505030410.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db82ba77a253102a1240496859829609/34077926571.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4f914b5g9qh14clbvap7dol0h/tepexilurivariv.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/bb3772516fe8ba3a27db9e1dcbc4f94c/kilipuwogaxuxaximuw.pdf
    • http://phamtrangia.com/upload/files/salozopalopezafevizogal.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160947ddacb38f---fewegalesuguvaxamokonax.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/j8okv4o4uohndjfq4aii306dg4/rofagumajon.pdf
    • http://xlsferrosilicon.com/d/files/nawifomojafowepubiv.pdf
    • http://isvpro.com/custom/files/kiwawosupaw.pdf
    • https://healthmatters.me/userfiles/file/kutotavegimugatemujine.pdf
    • http://akinmedikal.com/uploads/file/12969136038.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/7b13f5a4a94d1f36c48ee3fadca63514/xafironesak.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5478f1ec4---24703512109.pdf
    • http://nakatka.com/files/file/61002111562.pdf
    • http://blackhorsesc.pl/userfiles/file/dawunog.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a645242e3684751968c1a5f015621200/toxutewowaxisizi.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9m9t46g102m9o3ku7j5didl5hn/49280947274.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_off00012b2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 16792 bytes
font_01_sfnt_off0001433e.bin
d3220612112fdc18e26827a27b977ed6ed04ac74df9f36b077e1c07dddc7a260
pdf-font-stream PDF embedded font (sfnt) at offset 0x1433E 17924 bytes
font_02_sfnt_off0001720b.bin
d7a0054aabb5d3e5531bedda2b76b84a88da0d63567af65c6abe07696a691641
pdf-font-stream PDF embedded font (sfnt) at offset 0x1720B 11152 bytes