Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa050ad75ef69a8e…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 03:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1066a35a5b9e335ad48bee5264d7740 SHA-1: e5ebb30f5f5c67b49bd574bcb65174cbe83fbd4b SHA-256: aa050ad75ef69a8eb313a45634feecc300ab0034367b2f549d3cf3093373ed46
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and does not provide clear textual content, but the presence of link farms and compromised hosting points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://moreit.ch/productinfo/file/vepejunibekojuzi.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d4c01274da60dcc109b78ca97c0882f5/sesemotanamidimakulupo.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/2254465356.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e2d7a618---jisafobidabanojaxe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e334476330---76513780641.pdf
    • https://dycmc.com/DATA/upload/files/202106250214544683.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfb9f527f6---60221959766.pdf
    • http://alliusie.com/userfiles/file/xudevonajigigisowu.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3i7vbkn00v0q1k4jpcm9gjvhi7/midavuwa.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbc2cd799---3788151680.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/d1p29ff2vem4215hd1n9tlcbej/pikepunot.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/fulnjslm27kuj4om0i4sn7chk9/37542000348.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ccbb0b46e930f774380a901b5d2ee670/lenawexijuvidikabilotu.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/20d85f68a47878292d1b0f0b6d72464d/pajifapofefenotamipozavo.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/db742373607d3724c88125abf3d37c24/77987875476.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b94e2ca11db11bd1f5739e01ccd3b836/sobipobep.pdf
    • http://ray-king67reunion.com/clients/41562/File/2273748451.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/widubeme.pdf
    • https://kueapem.com/contents//files/vapesunipukag.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ac9ad50---palujego.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b13b2c265---78020785734.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=uses+of+x+ray+waves
    • 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_off0000f6d9.bin
90cd9ff5a59589d5a9fb1fce54cb3a296f8dfb2f9bbd9a9c6e33b1194cb61f8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 10240 bytes
font_01_sfnt_off00010e1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 16792 bytes
font_02_sfnt_off0001262c.bin
e78ece00421106a0e3630259e62c705220f26d4da6d0a62eca9acf24d6951840
pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 17056 bytes