Malicious PDF — malware analysis report

Static analysis result for SHA-256 a012a7185d2996fb…

MALICIOUS

PDF

113.1 KB Created: 2021-06-28 00:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d893fdc20240369a9d7f92b5a540b487 SHA-1: 0cf0f97a0f30f0d618199001139dd9d52724d61a SHA-256: a012a7185d2996fb9410c32ca0acb598f1ee49efe282e49e4afcfaeb74180c40
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://bpabv.nl/uploadfiles/file/67988591136.pdf In PDF document text
    • http://healthywithhart.com/res/file/4036494193.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160724c1c28633---foxafofimafokojodepixovo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/neraxubadosem.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5c40398b---gorevuzibaviwugufij.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/51ccd05d49e93c84881339045e85248f/wesejevotanase.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608de141b1c94---72814820107.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/77504874660.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/nowudafun.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a7aab5ad---14485347852.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/42650284195.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/70df45f51e63998e7c467add8ca5bf7d/30554552062.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7666c172---jijesupatu.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/94458551711.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/46250222186.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///76689089996.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zewuwolifitoges.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/vupapaku.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/147f19dcc056f34cc0bf318b13c5c6ef/4349086985.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/91211051555.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079272d23f3a---tobabogugomodugadofoxewol.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/67558692142.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfdea369b---70322541755.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a780441020f---bumavaravitemebux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=youth+issues+2020PDF link annotation
    • 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_off00015a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A31 17572 bytes
SHA-256: 7a29a4a3f162d28ae897400400935a92e5b01bb50b5bf1d8a9fc9df99f1732c9
font_01_sfnt_off00018861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A078 10120 bytes
SHA-256: afc5dee6be1f52e18362999554fa89d61c9398af12319a5b99b0ac925f453d20

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