Malicious PDF — malware analysis report

Static analysis result for SHA-256 971aa934576640a8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 10:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4880513397290cbc8dfa205e2935ad37 SHA-1: d3c4e645c00d561f85db8ec1931cad193a94b6c9 SHA-256: 971aa934576640a87251a4bb93fbd7ada2ec96cee2670f68c82b8f43227c452b
156 Risk Score

Malware Insights

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

The 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 pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not contain exploitable content directly, but serve as lures to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zippy-inc.com/app/webroot/userfiles/files/92365717313.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4699670ad---93595682937.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/zajene.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c8846e57---witupinukedonebudowobera.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/31175578079.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/be6c545985d92c28fa540e4c62de1215/mivebuvugal.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/nexesusonijanidavixapo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097bcadb7999---vokomofogexuza.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zamowilizuvepe.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/70442137404.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f4c8d0064eaaeaa12793f645a7407a47/fojakawerejere.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/66520134943.pdfIn PDF document text
    • http://royalgroup.at/tmp/vaporatekepibum.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d0f4b545---8337150745.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/7845125175.pdfIn PDF document text
    • https://sanidom.pl/img/file/93360314438.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/64lnc8ib66rkn88fscqgntlfe0/maluze.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d8ccf16f7d2d0cb2bd714525dc7af193/84279931839.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c413d05d---vijixuziz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/94236a7973426f7da8660dd6995eb9ce/72773542577.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/sipitosezijaginegegasug.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/xajunujilokop.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/77090373646.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/72308815221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=forensic+drug+chemistry+pdfPDF 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_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 18004 bytes
SHA-256: 27cd7f677c93d68cb517fc90da3b1deb447b64a8c3836a314f44b2394fb3fe30
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 11048 bytes
SHA-256: c8a008c8e6863ce4a8c8e13dc9bc3f6e9c0b9768cd7c1669d0d1f5765f98d246
font_02_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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