Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aac7a49b3dd30b5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 09:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 265ecbf8c212298a04c5dadaccfc989c SHA-1: cfaf32894d982e9e6a04ffad2d77c11becebebfb SHA-256: 1aac7a49b3dd30b5c368742124244a0e2499388a0bd35890ce51cdb9cfadc496
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS platforms suggests a tactic to evade detection and reach a wider audience.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://optimumquestsolutions.com/ckfinder/userfiles/files/90152362089.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9gnofmpjuln0k07l0ra3qqkj62/wekigixeg.pdf
    • https://novahealthclinic.ca/userfiles/file/bojukavujifu.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106150903522443.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/e199dfffd6321298826a5fdae732bb08/kexogeki.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c236fc68c4---89072141700.pdf
    • http://inezorviskids.com/clients/37546/File/kataropelupiku.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/59405408655.pdf
    • https://mimpishio2.net/contents//files/51548527089.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jegluji4q7be6lpvdljukcqdbe/woguzakekofekajefe.pdf
    • http://tnslib.su/userfiles/files/53361275141.pdf
    • https://reniuved.it/file/kusijejamonitonotixonaru.pdf
    • http://kochamsushi.pl/UserFiles/file/xigipugafuwiwazibafepunak.pdf
    • http://doreenindiatours.com/userfiles/file/27226067831.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efdb67d982e---denif.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16114c401da5a7---xizime.pdf
    • https://mccartha-cobb.com/userfiles/files/vapojezasadubanono.pdf
    • https://designclarf.it/file/64446669169.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/q8tvmes19ppdo1sn5vsfi45u2u/pexowavixelalunuvo.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72cf6edd5---74746578816.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f8c5bcfb1---bopuxerodij.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fa6c6d8764c16da6e042b674451f53d0/15609852154.pdf
    • http://medicalproduct.hu/images/files/12212056317.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=5+estados+de+la+materia+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_off0000c982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 16792 bytes
font_01_sfnt_off0000e199.bin
c84d94b0d86c723f83b2da44cdb83abb9664b29295032ef604b0007128dbdb6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 10592 bytes
font_02_sfnt_off0000f9c3.bin
cf5c497af2c3eab8d42436bd5b114af8c789c77c58218d74a7c10126b47f7f69
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 17792 bytes