Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d80e4485cf0d0d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 06:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af7f9b70726165a3396f20fdaccc27f5 SHA-1: 7c9f5a0184dc4f4e1fe88fff64099eacab079fc8 SHA-256: 09d80e4485cf0d0d14941021ed3d17b748dab514792fbdc6c083d95b92394248
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bestbuyfromindia.com/userfiles/file/15728204508.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/54801839f9dcdedbb0c912cecb783e88/vajasusazaxodijuwufukunom.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/811731746.pdfIn PDF document text
    • http://rotang.net/userfiles/file/nuvuzo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vezejek.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/74dd94f0dd19110ee1cc69a76546ef8d/48385977563.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160990e4a9b479---25665469385.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021082211193573499.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/41344281594.pdfIn PDF document text
    • http://kbchina.de/upload/26737629977.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/73274226931.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/59546157332.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/nopubajivozanomuxafalod.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/funirusilupi.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/bigufodovi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c97453056de---bomisakod.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/ligapigerewefalatu.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/gufekexigasewap.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8f7897bf---fakarikewetozex.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/47948154758.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/93412113569.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1489338a6---pobubamosufebevasigudajef.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/fanatibivopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+vs+automatic+transmission+price+differencePDF 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 18400 bytes
SHA-256: 500e1be91569a2f0556ea6e5921e4a6c1902a1a6d9b2173aa708fa7b3ebe4ae9
font_02_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 10940 bytes
SHA-256: f9544ecbf8ba80537d17f88fbe7a6f45f331d134a90c78d8e5ad9f5471602242