Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a836a323ce3466…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 05:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e4ebaf12641d90488bfb2d948a3afcd SHA-1: 8fe0891b9f3f3924dbb595f7de83d4c439967c20 SHA-256: b3a836a323ce3466826e4ba9d58267173b9c8b53626665bdfb542a6b4a1a70cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=sales+performance+appraisal+form+pdf PDF link annotation
    • https://koncnc.com/genelresimler/file/35961463996.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/saxiwujaxujot.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/51664708358.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/lisiborilimodem.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/fumura.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/nijovuwik.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210629165144_xe3gg0.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf74f995fe9---vutisabisuk.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xerarironosex.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/11728510047.pdfIn PDF document text
    • http://agrion.org/upload/fichier/22007134183.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/solefalubagimodudivixaw.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kajawukutifixa.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/boniwenudakuvekot.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/93387495693.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/neruwadojufafokuv.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/7042351703.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623546981.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/fbc81f000c69ddb3a91c2ff1dd05fe11/64982563684.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/84704151868.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/k5ppgl1e6cik413p85umj535q8/davuluzuxusevosur.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/32850173573.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/54108039197.pdfIn 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_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 10760 bytes
SHA-256: 42ebb8eb577ca3bb21c22b0778a3dbd8393a7fcde88b3f745d09e243a7a7198d
font_02_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 17496 bytes
SHA-256: 5b78ca4640c11918222cd135ff88b1b4a2212093710ce4e9e5271f350eed6036

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