Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef1811612c5adf2…

MALICIOUS

PDF

92.6 KB Created: 2021-08-26 07:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2691830d5bc769e088f20091ba9b92d7 SHA-1: 7615eac554759817311c9f7832631394cf19bea7 SHA-256: fef1811612c5adf2d6842bd4a867fbd2e76988e5dc28b851122d30886fe5fdc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://bio-obst-und-gemuese.de/userfiles/file/45579672991.pdf In PDF document text
    • https://mfdesign.hu/files/file/67613223104.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/93915394562.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/aacfe178d3d5d25d2c1db885854b8ba8/72190469065.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098982ed4010---juwepa.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/lewilopamefukexaxox.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/pizelorugipawem.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1e1a1342cab93cc7b97afb9bcc143f80/60845639008.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836029022a7---zirorufupobelefop.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5467df34a---28063021683.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/15/file/risigovojusetovevupe.pdfIn PDF document text
    • https://rotherelectric.com/files/98696609562.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/40140129192.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ba9e96d1b311b87a443443b01345806f/20681737451.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/52749570880.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcde17d6f---94346089368.pdfIn PDF document text
    • https://atavio.ru/files/file/50604002897.pdfIn PDF document text
    • http://gbagencement.fr/uploads/file/venesodotomawipojazapij.pdfIn PDF document text
    • https://miet.hu/kepek/87528042610.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/zutubizavivomeme.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c381937f5fb8471fc1b795eb5a697a9/jaxemovadobazoropifenu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/513871fd7a3bf5674d3a7d86ece71389/63298479580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=reading+comprehension+for+pre+intermediate+studentsPDF 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_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 17864 bytes
SHA-256: 1a612e80e642ce3ba6fe34295e46ff32d128890a7d26ef60a9c79e4649e0e0a3
font_02_sfnt_off000148f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F8 11164 bytes
SHA-256: 3ce54d4dad037157910b5dcb92e299e0b8b6c9598e4b3c57822bd75dc9658bac

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