Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ecb8e5c03730c8…

MALICIOUS

PDF

88.6 KB Created: 2021-08-08 08:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b6fc2ee669c2d5efbede381944f1c52 SHA-1: 9cb76e9e80f7fb510e92a8960a110d0a5eeb6813 SHA-256: 49ecb8e5c03730c899103b567cf7b081b048f2ddf994dc3bae00836233ff1b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oncetrabzon.com/resimler/files/worifinavok.pdf In PDF document text
    • http://vmkmsz.hu/userfiles/file/xunafogujapasorupexaji.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/50550588307.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bdf35315325b1096c8fe4d78f107e228/ditixir.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607653c3c4cd6---50765333543.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/vokebusidun.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/vonezuzipoxonizekabegagal.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/230502aa3f38a4d7e0153234facdf228/mujoredexa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087694917dcc---58579808633.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/90492553632.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6nvf8u3eehbfmoupvrd9malvl4/36887662287.pdfIn PDF document text
    • https://sanidom.pl/img/file/mirusaxu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5ef4hqr1hqn8ug840id8umiln5/nebowuzenotupil.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b249ec74baac207756d6aa2d40d43277/verozisixijuti.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/33127223702.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/11893288360.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/98855267514.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc270264413---nezakunizi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/42acc6356047daed48128d265eb2572c/73045778514.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a829962b795---65242754492.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4883613b2b---siwobigetukaga.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31bf837958---93513194970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+pass+the+alabama+permit+testPDF 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_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 10632 bytes
SHA-256: ea29411040b64b5f716b5fbc889b4e9fe3d4effa6f346e4c16dd9905fe0a101f
font_01_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 17100 bytes
SHA-256: b8c0e065914c21ed37970eb5dc59e5a5b2d04895b5598e5bb23fba5dd18b554a
font_02_sfnt_off00013b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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