Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac71960443fa238…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 20:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d56f053c869463f978cd0585fd6f907 SHA-1: 12427d36d5993310362e4a2ea6d28b87a078fc5e SHA-256: aac71960443fa238001e182e54c9db0c95cc0279e2cc711c75e3805d43833271
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and disposable domains. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0348039a2a---35509972910.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/lujiwumoxeri.pdf
    • http://quangcongluc.com/upload/files/wuginuzax.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/g9btm8v683l350ovp5i4lhfro0/kulik.pdf
    • http://studiorinaldibedin.eu/userfiles/files/29703078784.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c554c4bdf696289b80fde4cd2f8db721/xurixador.pdf
    • http://kaupa.cz/userfiles/file/7562985185.pdf
    • https://stallion-international.com/userfiles/file/wibodatunojifedazeki.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9f21172bdd99d6ee6b903e760c03edfa/temajoromokolovuzotuki.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjilfeorndg8nuk8dlssdvk00f/vovirefoto.pdf
    • http://connect-senior.ch/uploades/userfiles/file/81432036978.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/7894384539.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c6f753160---geduxowasos.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a85791d6928---susivaze.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97716e50---22014326275.pdf
    • http://ubest.ru/images/file/tujovil.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/taxixajumu.pdf
    • https://veterinarycarefoundation.org/userfiles/file/66759973112.pdf
    • http://entrackintl.com/uploads/vatafugagowigegakofadiwe.pdf
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/23380669113.pdf
    • http://ptaki.info/imgekoprojekty/files/tudodadibegibug.pdf
    • http://morgancountyoh.com/userimages/28441367612.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=comment+installer+whatsapp+sur+iphone+4+avec+cydia
    • 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_off0000f5c2.bin
784229bcc0033122f4aa6d0c127ffa6574826af1b957b1d8154279233471dde9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 17016 bytes
font_01_sfnt_off0001223c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16792 bytes
font_02_sfnt_off00013a53.bin
2d65528883f466a8f32727873259f369b678bf9d9fd047237453511259f7ff4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A53 11256 bytes