Malicious PDF — malware analysis report

Static analysis result for SHA-256 a335f41977b790d2…

MALICIOUS

PDF

95.1 KB Created: 2021-07-24 09:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de036e11e9b7bdf0bd4f8b26afcc888b SHA-1: 7b9c8f1013c17b35f9a86518d192ae0534a8180c SHA-256: a335f41977b790d2a2b6bed5ff718a525d00d86260125c1158e5246c67cd7cb2
196 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of 'cmd5kprr2tv7d2c0lu39qtk/jimuwim.pdf' within a URL points to potential command execution or a specific exploit path.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://asbufestival.com/uploads/FCK_files/file/tudetadinokawepusunag.pdf In PDF document text
    • http://esipro.fr/userfiles/file/62345828713.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17ad8afd4---nemirafalinibibodawitogeg.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/gisuxabeguj.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/11142542490.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/9589389381.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0eqcmd5kprr2tv7d2c0lu39qtk/jimuwim.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608528899fd8a---relijawiziruv.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a6b1ca63a3df152634cf206a14cf4c52/14581846744.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b645c119a---97137446772.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a9fd97ea599aeaf17b20f3d688ff75c/texesojulovomazazekewubo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vb9ntefkb74tufkb3i8t2nomln/29212613591.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3a5a8c201923dc1b78804637225e87c/46879065008.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/35462496204.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/73737479781.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b512764c6---dobubadefaxixamogu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u29carhogat16ss2tosgdib3n2/suranorejefamanagubomup.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9981f1cb8---4833939868.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d758511fca---naxibedirufiganu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/foqveuntc18v730ii250bvpm85/52718424332.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/46125460278.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/73qfe9uk4ptd0h5s82svakr8d3/kafobiw.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f4cfac8dd94c44637ab135cfef62d716/kufekabinoxiwepediz.pdfIn PDF document text
    • https://www.temsilcisiteIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hands+on+machine+learning+with+scikit-learn+keras+and+tensorflow+by+aurelien+geronPDF 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_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 11480 bytes
SHA-256: 567189e979d26964655a4dce3ed87e3c061be7e50edcd8c78e30035b31d49743
font_01_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 17656 bytes
SHA-256: e6a1f8fc1d7db8e02acd1cb3dde2121960fc9dde36bdce54864cd4df60794263
font_02_sfnt_off0001546a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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