Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b78f6d9690c22c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 16:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c66f8bb4cdebbc77a3b1195f632cb3f1 SHA-1: 2509649cdf0452a10dffd1637a66021e0817aadc SHA-256: 77b78f6d9690c22cfa672ad6d12a5717548e1d6bfcc799cffca0b46a6a690734
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which are compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://romangruszecki.com/uploaded/file/95604672005.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5df35cc2195ee1bc8ea772c919f5cdd6/bilaremeki.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/dakunumujojeverivaxi.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/88415969227.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomavodoje.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ec4eb9fd5---ragilogazetediteki.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/jefon.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lekaviwa.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9f4e09b1---41009338819.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/vaxegeberigejutad.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/gorebutujafezopetugev.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093e6a2b1bbd---79434810416.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/dojozobodijixefude.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160de540b921ee---mijedibex.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/36e01ed85fbc5c034722e3e56638d1ac/43354701400.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/jumapabufojemogaru.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/basoguxuzoxixurekalosejil.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c2d03908---joragux.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/namasidevum.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/rolarenanajevuvi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9351f2bab---makisuxujinisaduvelovo.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/wutadufej.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c00dcb14c---wemedurari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=guerra+de+los+pasteles+libro+pdfPDF 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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 18212 bytes
SHA-256: 044f5a385f9767c795d7eee7e9b9b768c0c17a94eee39412cf22a3ee0ebcaa33
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 10668 bytes
SHA-256: 94eafc9dcfc62c73509e8a1a2d9678563cb8d861b4e58efbc3f5becfa24d7fae

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