Malicious PDF — malware analysis report

Static analysis result for SHA-256 9221b32fe109e94c…

MALICIOUS

PDF

101.8 KB Created: 2021-08-03 12:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d56f76e161b90c7462be447f98455ca0 SHA-1: e9e466dc0e4d59ec05a564ca5e011134a7decff4 SHA-256: 9221b32fe109e94c14ab7c1c024302ecbbeae884f539126f167ac17c4e615ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baihsad.com/userfiles/files/20210731_054356.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bc5df6a---27756868539.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/72202956197675b3728c8597d01930a1/vuzakefewijilaj.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9ac9897fdbed0b323b3c8c0159e9c3fe/juvinamebukiwenozabazalar.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761a176ec70---1202370130.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0e442994e224417ad790ad45490cf7b4/ruxapaniwogegubamedob.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/rewibi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5adbda4a912175c61aa669067d383925/mijojavaribogumadobaroru.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/98aipmkrkns6705dv31ls7hte6/motulaku.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce36f20516---vujinakosukikuvoze.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921714dbebd---xobalolipo.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/fibelikigu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/22711398836.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/62f3a8ba8a536223c9a0ba89b57759a8/86439752254.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e5b8a23306dae333142f403cb01ac899/4251831500.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160775b2a1235d---pizifasufamekoxig.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d1c691e72a013c034a943b43be3feb2d/99408205099.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/99001148679.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ijap8ti3k2g08fufd76lmjlfhg/10089689077.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/dudosemajefegojudobepuwet.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/78032654884.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/kaludeduminavebitoxekafo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd14bb262---felatojolusuzafusuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=international+marketing+research+books+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_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 17500 bytes
SHA-256: 9a156259d6df8d456ddcd3f4dc6e8caa9efcd58c61ca7c2259db419449e9c1cc
font_01_sfnt_off000156a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A4 11248 bytes
SHA-256: f3210c59e9e999393e9dbc634c891614fd21f2f7e5a0af82142010bf9c0ee8ce
font_02_sfnt_off0001705c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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