Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9a434d8b087ac0…

MALICIOUS

PDF

95.7 KB Created: 2021-07-06 21:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cca82b2ba2ed11209f1ee0bf08728f01 SHA-1: 4497fe18bc2bf1f13cfeb257ed592a688252bbbc SHA-256: aa9a434d8b087ac0e3dd1d979c6d95a2aa8328d560e2905a7cf3f503a9311b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a tactic to host malicious files. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf38506333---20928484052.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770f03e09a9---80305577752.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9b67098f4ccd232b841e4dff64d13de3/5023424254.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qdu7adbme019pjr6dt9875bj16/89631706669.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609751120695f---nizozezuwozira.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f89a2d4a---devalapegasebimiwekek.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce710dfc1---zuxopowikepeg.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c12efd04---65715201707.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/82ce8fd4c921ce3d21d0e73f8634f138/20439756416.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/xiweloneboxiluzakoj.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675cb31ae5---xafefug.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/11030395088.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/sozep.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1126028e0---binimupivebewesuwagejes.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089b34d80c81---jusovuxadatikubada.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaffa9545d---xamanemudesapuzoxe.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/d5d1dfdh4rhpqnuje240jlpgf6/loxumuzulodulakoneg.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b45a50c2f---kogiwonibabibigebebel.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/7635044288.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/vefafiwaximo.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/48923874237.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713662a30d0---34100595017.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b8140690---ferusetekuputofolo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbbb43888c---72731148118.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/mowod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rise+of+empires+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 17304 bytes
SHA-256: 31e377d2d9f63b2f53864ab8b13050426173725f7397aadb18dceae273d3336f
font_01_sfnt_off0001439a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439A 10276 bytes
SHA-256: 2f1d9f42c6995830aae03268d66a428053c8b96f0c484bf919b3b2ae527f505e
font_02_sfnt_off00015abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1