Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a2da5239f1d1e1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 02:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d42f3071036a5689ff237f8cb2ca68c0 SHA-1: 4bc87abe6b22f1c6b75980e69d4bbce3bdd6253b SHA-256: 63a2da5239f1d1e1a051cc17292594474adc995336cfa763bbc226f0d708e0e5
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 are part of link farms, suggesting a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The presence of external URIs and link farms points towards a tactic of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ktcyy.com/ckfinder/userfiles/files/gemawininabovemulavokefum.pdf In PDF document text
    • http://kanizsakran.hu/userfiles/file/10872530023.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906185606.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/bemeniveruwukukok.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/73186474233.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b9bb2341---mepejimoxubejevule.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/simipig.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/kuvipatipululegukejel.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109011100077111.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/37038144264.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gozatexuzupazaresi.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/lavomulaxovogojutase.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/rewusumavibonilo.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/sobom.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/400100c86028191886ac75b36e063f4d/70061997187.pdfIn PDF document text
    • http://esteel.my/userfiles/file/gazuregesuletadutup.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/7907873366.pdfIn PDF document text
    • http://wamer.org/userfiles/file/gezamudap.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/79516348322.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/fowibodakimujikawu.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/76440216442.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/biselafagotarabibokaguxu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/gobidupuwutesewezo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9b12f48cee2e891826eed18edca1dde6/jokupirukupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=incredible+hulk+game+download+for+androidPDF 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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 11028 bytes
SHA-256: 45937f68a591c911adc2f284fb38de3eccc0af0682c339e06b34eb935a8ca85e
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 19648 bytes
SHA-256: 0c15070b8b21b1945e0157dd76c372fbb604407077aa2155079a02091de56229
font_02_sfnt_off00012601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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