Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9d437071275a71…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 03:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2ecf609be5d6dedd114f1fcc94154b63 SHA-1: 633c7242107ae8cdad8500b1af92f07cdddc1856 SHA-256: dc9d437071275a71ea69fbc9994b3f1eacc94c35bc6cff87e45de9dbe8dcca84
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites, which is a common tactic for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://crysiq.ru/uplcv?utm_term=engineering+electromagnetics+8th+solution PDF link annotation
    • http://aliceinformaticasrl.com/user/pages/14516207157.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b277a61c1e---duxuromijuxina.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/vatiwufodubolare.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/lonog.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd058ba61b---weleromeganekuvin.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/35595078222.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s6g31f3u7vfsk5f4lshka9joi6/8827708240.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/42324437870.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b183c4f2097---feguwogobusetuxup.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c319ae2a182---pipinelobame.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6717b445---21494553585.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/19697630213.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210611120143.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/pididevizanivedadabo.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/23475342682.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/mujoxalozudiso.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e4e0a0ab---29974021949.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/jotojowuk.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5c0c817d7d0cde9be6308fe3e8e3cd01/3541714349.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453134d477---27848667057.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/758c94f4c4dfcf89a48776eda7b772f9/72358696016.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d4c9977731d420616a09b0a2480b3a7f/lagalepajusilepazikosa.pdfIn PDF document text
    • http://www.beatricedbeauty.com/downloIn PDF document text
    • 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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 10968 bytes
SHA-256: c1fca44850b15383cf8cf4a659ac32a4f63e66660dbc6bdbaa1fcc712a0e8c1c
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 19716 bytes
SHA-256: 92dff8089af36062a5bd186ef38c7996a5839d135d9f847ed96fd110f2ae9bbc
font_02_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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