Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8aac374bc314eb…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 02:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8bec9a278ed61b95589dd4ef5bf5cc95 SHA-1: 1672201b6ca9ccbea6b6de4ba03be7ef604f3d9b SHA-256: 3c8aac374bc314eb2163c4bc48fcb8048748817e8d7809057e15588343a68981
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term=macro+auto+clicker+android' in one URL suggests a potential lure for users searching for specific tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=macro+auto+clicker+android PDF link annotation
    • http://project-lovcen.me/userfiles/file/21562380387.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/51891149960.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/mabevinawajisesagi.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/52460591601.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/76302752474.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/96198946145.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/67913169948.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe4e4f4a0---koxedowofeni.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/jezenumobawadogut.pdfIn PDF document text
    • https://masukpt2.com/contents/files/sasabitavubirul.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ef0e8a356157810830e36eafd8493094/37652125674.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2c6d9011---xobabibulejijome.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/39270625228.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/jiginixasoxebew.pdfIn PDF document text
    • http://pasted-radio.de/web/files/30089006396.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/lojonuwosedilumevukepi.pdfIn PDF document text
    • https://eslms.com/userfiles/file/juxonotepewatadoreruti.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ar7a7ucnjqm5ud0u5i61jjt98c/vumafudutodipixerure.pdfIn PDF document text
    • http://w-mill.jp/images/file/jupedotolisupisavumudeta.pdfIn PDF document text
    • https://andana.us/files/files/25133577532.pdfIn PDF document text
    • https://codecs.ro/images/file/21869910816.pdfIn PDF document text
    • https://cargotavio.ru/files/file/7302992141.pdfIn PDF document text
    • http://apple888.vn/luutru/files/57902081409.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/dubazevapizupusepi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 14648 bytes
SHA-256: b8821a941e7e33c18627e8131d2d79a56ae4421831a71a3f2aca5e05cc636cb3
font_02_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 10380 bytes
SHA-256: a9eebf152498b1a0177f1610e81dbca2195340c2df73e9bb96e5f8ec45ea1316