Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2aa817a8df3e9fb…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 10:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ba1027f420e35199a662a98563f2cf2 SHA-1: 73f2135f462f83f00fc965d90d0db0d6d77ac78d SHA-256: f2aa817a8df3e9fbf95cb7fc9066cc24597d6249831d1e5794520fe8d28fea90
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://astprom.ru/sites/default/files/file/84670678010.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacfc39751---89229457865.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/84940904978.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/nezuwukozuwofazus.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/51993697365.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/24981886981.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/89373952152.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70f12232f---mitixevuwaj.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/sewumikewebumituxomob.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/25393631470.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c94120cfbea482e5340fb740c575a115/pivejarutob.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/vibisekuzumonemuwu.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/pujusivinapaxisukox.pdfIn PDF document text
    • https://etadelloro.it/images/file/difisigon.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/16197292515.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/54612019732.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/12919314891.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11948301232.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/51096705145.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/68370645077.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772577719b---jamavosagigari.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161356b1ea60db---fumasukimovixewuxezega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+my+phone+screen+mirrorPDF 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_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 15784 bytes
SHA-256: dfa1032aa2db9eb03b70e93555d70618d1298e5752b7bd6f15d14f517cf889a5
font_01_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10640 bytes
SHA-256: 2a5c6b833dc594a948756fc5673afc83bde75c110772eac17f813a096c476e74