Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06a4888cdb4b3f9…

MALICIOUS

PDF

72.1 KB Created: 2021-08-28 09:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce36c36efb2193db889f04883beb5216 SHA-1: 9ed32cca8e7f84257761d06f663b156b611a25da SHA-256: a06a4888cdb4b3f9900dc93253c78626115db43ce5a7b567e8ddc962146b7bb9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080a77fad9f2---34480493911.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a969d0847a0---22914283256.pdf
    • http://banlinhkienlaptop.com/userfiles/file/72095170939.pdf
    • https://reitinguok.lt/userfiles/file/30503325023.pdf
    • https://sanvexe.vn/webroot/img/files/32119189197.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tqi1j2oe6mer40fb36uf1a7ud2/57450062257.pdf
    • http://kmkonsult.cz/userfiles/file/venolibumujusurelatizufe.pdf
    • http://adimhukuk.com/resimler/files/19093302379.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/33528263415.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/5252108794.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/eadd60fc62e81752518547e27c6745d2/samopomox.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/n9coenmb1vvifn60dn1trrd606/96337527052.pdf
    • http://stark-tools.ru/images/uploaded/jusuzibifemakadumamilosig.pdf
    • https://atlastoursntravels.com/userfiles/file/4276878322.pdf
    • http://smartwealthhk.com/userfiles/73803553871.pdf
    • https://drddvichitra.com/userfiles/file/77437684017.pdf
    • https://turbooto.vn/upload/files/62780261958.pdf
    • https://icbacademy.com/upload/files/65549820373.pdf
    • http://devitohomesorlando.com/userfiles/files/10640047515.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827fbd14eac---nuruwixisusajunoxun.pdf
    • http://ventexevent.se/uploads/file/pedokuxakeguzesupuso.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/afc01f8f9124ec2265e4d6233f05001b/zigolizixojejej.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be4b42558---29385943126.pdf
    • http://3dsami.org/uploadfilefiles/kibutuxijoxutidolivobutuz.pdf
    • https://nguoixunghekiev.vn/userfiles/file/4751813629.pdf
    • http://trans-serwis.com/userfiles/file/vesapelofejagepasematij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lyrics+up+around+the+bend+creedence+clearwater+revival
    • 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_off0000ba7a.bin
30311445c62d64fac55d9f350aafced15e579c6f5a5ecf1508c13c3668d6c869
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7A 11072 bytes
font_01_sfnt_off0000d40e.bin
d290b946ac0e6a9cca40b4cad0d5d4b63a70bdf5864058887aacd50b729dc332
pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 14976 bytes
font_02_sfnt_off0000f9d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 16792 bytes