Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c49b071acca693…

MALICIOUS

PDF

90.2 KB Created: 2021-09-11 19:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40fa4b73fbdd235aaf59f9bd595ad223 SHA-1: ac3e232ef3eed9f870722956940b4405b741e3c1 SHA-256: 45c49b071acca69388622a4d177b57cfcb87337f8f395453a7171b7a0ef9695d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://nomylo.ru/uplcv?utm_term=dragon+ball+broly+123movies
    • http://toanlinh.vn/upload/files/37904364521.pdf
    • http://studiolegalebisantis.it/userfiles/files/jarojepufinipelezabek.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1008e2b01---73597413466.pdf
    • http://irk-yoga.ru/upload/files/pokenikume.pdf
    • https://canionglobal.com/FCKeditor/file/mogowes.pdf
    • https://krassimirtaskov.com/userfiles/files/42874981099.pdf
    • https://iamtimeshare.com/userfiles/file/18101890766.pdf
    • http://ultraljud.nu/bild/files/63890453110.pdf
    • http://noavarservice.com/ckfinder/userfiles/files/bedanefeno.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/pekitutipawepido.pdf
    • http://noospc.ru/SITE/files/editor/file/95911603431.pdf
    • https://menu2uplus.com/images/file/depawagubigutabolafimogew.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613be82423cf4---68393248804.pdf
    • http://aaaexpressheating.com/userfiles/file/87237058541.pdf
    • https://liftsystems.ro/LiftFiles/file/95683485200.pdf
    • https://santaclara.com/wysiwygfiles/file/murogemasumat.pdf
    • http://internet-trade.eu/UserFiles/file/44414801455.pdf
    • http://chinasoftcore.com/userfiles/file///9322684766.pdf
    • https://truckforceone.com/upload/editor/file/legivevazozoralis.pdf
    • http://solo-reisen.com/media/images/file/98101942503.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323546a3f53---41186345245.pdf
    • https://aramlasmerok.hu/uploads/file/zinevesagosapizelekimutu.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a95ed7f282660d523c1056c9fde39fbf/53276916883.pdf
    • http://w-mill.jp/images/file/perataradegategujodativ.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/fifawapute.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f833.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 16792 bytes
font_01_sfnt_off00011045.bin
f3d9da8180f1efd6dabae36f699fcf7288951c03653d4038ea1e2032fa5e54d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 18896 bytes
font_02_sfnt_off000141d9.bin
088e7772f4af185e98e09180a439a3644a5a22ef99dc70b25aaa9ad33e1bcfe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D9 11016 bytes