Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b06f6ac0723e9d…

MALICIOUS

PDF

77.9 KB Created: 2021-07-18 01:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdf556101aca28a1f5e77f479384a7c6 SHA-1: 18ffcbd0bab94d8473d218b4e9fe7b1b32c94d03 SHA-256: 90b06f6ac0723e9da42100317cdcbfb16bc65f07081aad3ed6cb76758a02c5e1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to redirect users to potentially harmful sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8d5394650dbfa5235fbfecdd7931a146/rekemiwime.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/84211759155.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2c20fd34a3ce2679b0b7adcc317ef74e/sugurosugi.pdf
    • http://amexeuro.com/an3_Uploads/file/32927311329.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c8a017e9---3858074646.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/29534b28ebd3e0b37fefc499e0e592bd/radobujewumuwop.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/da1877deae482bbeee02efa5f7122e52/ruvixomuluzovubowevox.pdf
    • http://toyteepee.com/uploadfiles/file/210609132245619867yufv59.pdf
    • http://nktrading.qa/file/files/torerulesujonisas.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ae244add---zobix.pdf
    • http://a-mega.ua/images/uploads/file/zowum.pdf
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/f7vtshf5er703471ank17rsfso/giwitakijuwuxogixadebadi.pdf
    • https://accuratesearch.com/userfiles/file/datojabodokixe.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5e2770fd2a8662f96081d78e9e67deed/gujikuvefeniketegisidulo.pdf
    • http://alrabbanoilandgas.com/file/files/21771551986.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a010eb6b751---kekezabarabonujonapa.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/zumikakagu.pdf
    • https://angelsforwarriors.org/userfiles/files/jilolitevonupidujawe.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8d3b65da4---37216863204.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cef17a8d90f---legiwudi.pdf
    • https://aarhuskortet.dk/images/file/46553860762.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b1875efc7---noluxuparo.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/55495f038fa8f08beb93aba170035442/sabanukeresel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=500m+to+yards
    • 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_off0000cd8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 16792 bytes
font_01_sfnt_off0000e5a1.bin
f324a69ea8bcb2e76e71347b34dd4d12bd33098c852f5cde7e132cfde978c025
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 10308 bytes
font_02_sfnt_off0000fce8.bin
f27f1d6b9ac62a12d27af3034037d25b6e65fd51634dbba7746bfba430f5a2c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 16956 bytes