Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa324e87fec1ad7e…

MALICIOUS

PDF

80.9 KB Created: 2021-07-06 09:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2ee5691215d69515fd6248109c7ee5a SHA-1: c9ad73035bfa2dbf1c89e2a8565d0f164be8e97b SHA-256: aa324e87fec1ad7eeef8859fc36ebb29efd57675f54dfb50f3f98cd00910fd5a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=howard+county+real+property+search
    • https://dbjadow.pl/attachments/file/44804148081.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/81615603683.pdf
    • http://budohurtsa.pl/userfiles/file/39447111652.pdf
    • http://araonline.hu/uploads/file/31243323359.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070934747202---mepumafa.pdf
    • https://aakritidigitals.com/userfiles/files/xapumugomoxanej.pdf
    • https://hosvagyok.hu/userfiles/file/zidusevupa.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0e6e9381---94763660494.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f9ad642c519da2dea05b101d07ed9673/soparipaxupiketak.pdf
    • http://www.europesolidaire.eu/userfiles/files/57104830200.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/27db3ed2cad8b9158b800e329acb7659/16461688765.pdf
    • https://et-auditing.com/userfiles/files/wubovubevavolunub.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/nrvg3souhtq3vq89vaaa3ch7n2/62717528561.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/mupowefopeboletukujaze.pdf
    • https://aduanaldelvalle.com/userfiles/file/vewiwesitiwegikikofigetus.pdf
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/0srkost9un2nde1ni81e37vlp5/tibifikinelemupetozosa.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936e62e4d44---dikulepipokepuxaned.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160897b3e1bf34---76559064124.pdf
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/remowa.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7vi53v57nouoh642r83c12b3lf/sebipabegulinogesutul.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17c70b0b9---bavazeridoxaf.pdf
    • https://kermanrooz.com/img/files/xijagasogeriwetusemuwanuk.pdf
    • http://ecovn.vn/uploads/news_file/panibaga.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/radikekiloniwovenupa.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/84992942959.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_off0000d289.bin
27240c657d10aedc36c9ddd2832551a3b11e2aaaa6aa09fe71d7307b3b774315
pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 19608 bytes
font_01_sfnt_off00010535.bin
727a17c11eb5a765b86c5d6de36e105b61fe58c95260a7a67f45b3fab7751efb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10812 bytes
font_02_sfnt_off00011e29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16792 bytes