Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0da9a6de75be3fb…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 16:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6755c48779826866532d3d6d2d5c120 SHA-1: aa98517ea6abb425e7d9ab52de9c57b261bde033 SHA-256: d0da9a6de75be3fbfe87b1c998a7af0e402aab8ce9eb7cb4957021cee0a0adc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a02179426---41093779049.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/82emrucg61vlo8im11mpck4hlc/85330728853.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4nvu80hei4u5oqrtfsh32p07bq/95769167748.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4849aee9e---32050098783.pdf
    • http://alimentosldm.com/userfiles/file/94910597297.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/12708085335.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ed520462---fopotigujazuxi.pdf
    • http://w3-japan.com/js/upload/files/70523468899.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a31877924d1---42774773647.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/05304793402c2cfb33af41be8961e21c/zojusepatopotewotumapo.pdf
    • http://elsekmont.eu/userfiles/file/69638791276.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a5be751edcf3675b0e4a3d51d88a9645/xupiwiwizikoluxol.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/515f0d65c06733738375f75235d4aa46/nowuzefuk.pdf
    • https://baongochoa.com/upload/file/baseparitim.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54ff121a2---xibebimepetavoxanutate.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b67e8096---vogegorojejiw.pdf
    • https://xenang-mitsubishi.com/fckupload/file/buzadisowepusirokigan.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd98479ae0---nobewepik.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d7c014b9b39cb5326d89272ef52c4eb6/49785279216.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/af94ef6c9efc845937113f4609d9b4ba/xuwepejiremenuvulujofiwo.pdf
    • https://luathoanghuy.com/uploads/files/tijefavivaputi.pdf
    • https://avenue102.com/uploads/file/mewinewurelitebikumepov.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/musanesese.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=water+glass+pencil+drawing
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c831.bin
80fa1085a2b735b24646f674ae81165579cf85a7172e6fa91ef1c5a9b0a513ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 16772 bytes
font_01_sfnt_off0000f368.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 16344 bytes
font_02_sfnt_off00010958.bin
a8dfa31e81e4ab78067ce0ad476c2f72bf5fd96703f8402eee7ee380474c249b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 1668 bytes
font_03_sfnt_off0001114e.bin
753089d455aaed54e3effbd01cb4517971811e967da6a9e7d35dec29e75edba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10648 bytes
font_04_sfnt_off000129a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 16792 bytes