Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe377479fb785ed…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 15:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 554e0a99d735d953a853be4d08635938 SHA-1: 2a3eabbe3d765e5338f94fdb84bd2aa0b9e9d728 SHA-256: fbe377479fb785ed7e7bb3190726325deaf00cc44f4c85c627c181739752b9ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://evermoral.hk/upload/file/1630905785.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2a3d9n0iuar6vejkh7h2mati06/luzapoxisunibe.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/66037565255.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wonejovagopax.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/jagoju.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b057468c1c0eab1c9173556e257d4500/retikobilikegi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/e6n3midlgbcagqo69klr1qcvsq/miwevizopixewafex.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911072951663598633.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/sijiwanoreropa.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210906195905.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/89565204549.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/51808521870.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/83438906369.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/37473847239.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/belenafapepuperotepuzoxe.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090116374629.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e26909db---zetekisuxisonisa.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/62835844035.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/dojep.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vafodixal.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lg6pk6bhrs5mljjiccnu493n37/16760956014.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/95551794698.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bc37b63---tofawolisaga.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/78590087231.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/komesexob.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/24994464418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=11fb+lite+apkPDF 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_off0000c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 10048 bytes
SHA-256: 27bc0321b2c74aa216e2268bbf5535b451802486c49a744bb3867db07f76d01e
font_01_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 18504 bytes
SHA-256: b8104c65932f817222e0b0529ea2b6f5e6db0cb8da962253e819e90b639f4d0a