Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab78a0ccd41dd271…

MALICIOUS

PDF

97.7 KB Created: 2021-09-15 16:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a9b26f64dab96aa91d6e986c81ea909 SHA-1: 1951f37d3b5ff4f61fb430157a8258e8a56fdfdc SHA-256: ab78a0ccd41dd2716eebfe8a16d802f0f5f23ac766c36be113c241da6bfcaa76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of external URI heuristics and link farm detection suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=marvin+douglas+adams PDF link annotation
    • http://wsospice.org/uploads/userfiles/file/file/zubezunozimipukagamawix.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/47416003351.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/15929242671.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/52224422824.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/watanezivevewonoraramite.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd0b2eb75---modozal.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/58299688305.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/loritefiratagebevojenumu.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/90903589801.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/naxukemogeviju.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/mutedaveduzibuxovitika.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/54745115090.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0a7caad9283f5d9e4306385935f1f580/redumizesevoxo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a021782787---98128799530.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fefizufupanobotuve.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/99506423526.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/99737967646.pdfIn PDF document text
    • https://vestol.bg/files/file/vajukediniluwegetubopimon.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614173944746c---molisoxogufotu.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/39430701261.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26eeca80c---vedanirasudovu.pdfIn PDF document text
    • https://tsegypt.com/file/64031762500.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf89846946---37624106980.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_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 10520 bytes
SHA-256: dd7d74ba848ec11924d8cdaf380029c0f20a6f743227c4d8f5dd690f8ba5ebea
font_02_sfnt_off00014737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14737 19008 bytes
SHA-256: 10af94269218b67b8bb04a4af2f49164f18eef38073176f0f2e01de84778b846

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