Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f48d561bea54672…

MALICIOUS

PDF

91.7 KB Created: 2021-07-30 06:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e82e9754364cd8a40c9cd5bb7fbc9b43 SHA-1: 4d11c4a3f6bb58da6aa5d9c0d5be035d5dab1173 SHA-256: 4f48d561bea546722271566731875522d44e6925ac4bfdd234a0391c94e9b3fc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by noting the use of disposable hosting and UTM parameters, common in spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://infrive.ru/uplcv?utm_term=short+reading+comprehension+passages+4th+grade PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fffde0c8c---jowibefinowuni.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/umv35h51bq5rqgeeuk4vrbl7o3/73330438195.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ba4a51f224ee04c4129c366090bde792/mumigexupovokuwe.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/32799656441.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e682fa8e94f.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b436ce46c2f---81787579209.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2cdd8b248f51a080193c59dd761fe5bd/6471762068.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/nukinonaneweruzilojafu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-9/20210509010409417920.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0f2187848ffa045e6788259500d8ecf3/vodemurakaluvifomov.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160712e4c4ef3e---44489425226.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9ugb5p327iephlbdbrsud71am2/29200544491.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2aecf856a161264871ec10b74ba065fe/jawetupe.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/99690346309.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7af0e8980---wafakofid.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2e63c882---78736529305.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b99688127---69906784388.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/57678452365.pdfIn PDF document text
    • http://fittbikese.hu/files/file/fasenozizamifelunurorote.pdfIn PDF document text
    • https://daismene.it/file/vomijizamuluko.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3b528bcfa4a09d3bf2dc405feb7a4dff/jukobitururagi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4853de46f---bebawoxerasov.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/61849456644.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_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 17688 bytes
SHA-256: ed048ac780f83923e437e54b6b03c5cdc199d85d532b810193745e52b9b07c8d
font_02_sfnt_off00014773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14773 11068 bytes
SHA-256: 489c8f2c665bc4ee6276678405a27e0c68d527d6d21e7c3eb1f16ec7f404086f

Open this report in the interactive analyzer, or submit your own file for analysis.