Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07bdc2fd9d72f8c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-22 11:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 51520251d59933dd522ad3f50ef9a457 SHA-1: 0d10360c610c3a1b959813e47e4200e82ab53b9b SHA-256: b07bdc2fd9d72f8c92ffce473b28fc82a5eec7ec91398bec7767890fd6d03370
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://szentdorottyapatika.hu/files/10007509915.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s11dbjv8u6mcei184rjah76587/mufowaxegus.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///42579525159.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/38087442469.pdfIn PDF document text
    • http://zimmerei-possert.at/mafanu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/gigamizujisuxov.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf0aa2844---lesoxojo.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/70925647491.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/ropejudo.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/purin.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/bobivujoxodimugagogu.pdfIn PDF document text
    • http://hexindechem.com/upload/files/84775905987.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/wajasapiwujirazawux.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/90152836069.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/98779190700.pdfIn PDF document text
    • http://tulga.ru/editor/files/45074168177.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/60510087616.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/somalogede.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/piduzuvafowibarugubolelut.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8067a525---xitexorez.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/89450069495.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/winuvapipilan.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/95912655478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spider+man+unlimited+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_01_sfnt_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 19200 bytes
SHA-256: 83e1757e1cd99e58a3fd9ae297a7fb46814c71bd35fabc13a1a7af0f8cfae64f
font_02_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 10652 bytes
SHA-256: d0db74916a33e3bbfc436afd28a0919f462cd86aff4bea5a1725c8b1720dc536
font_03_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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