Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3ffd5c9a6f85c0…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 08:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47c8a35f2ec1d5f67c8e5efc16c3b14b SHA-1: 3ce163b633915b7c94520dd81e421bf107bcc488 SHA-256: be3ffd5c9a6f85c0c18f84e999f052490ea10e4c06ae49d03960188502ea4ba1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=supergirl+season+5+episode+9+full+episode PDF link annotation
    • http://studioferrato.it/userfiles/files/78305256856.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210905021641.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313509968bd---vapexisasesima.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/sitemewilasu.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/jexibexisapovufekuxizezas.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/12719840373.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/vorukogeragonitaso.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140341513d20---10022691498.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/venuvononupodofil.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8128b3f7---52679502217.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/14929179599.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/digirabexexevorexaxo.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/fidefewaxisezepepezo.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/23877900569.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/tomixevapuvitikixumum.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/nexuso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135504e25049---batagejivup.pdfIn PDF document text
    • http://novafish.it/userfiles/files/pojamegekofonofuranot.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/xafimujuwikag.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/34539698314.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/14321940541.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/12530596999.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd9a4cfe7---57757594256.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/3830014519.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 11052 bytes
SHA-256: 89f0ee967c9fbdc2fc4b17156b16f10955c34d7338688d7dc522962df2f43384
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 18496 bytes
SHA-256: ea21161be90b42b57f46a31674055f8fe12d6ae0e7ba4f4ada2ec611758b751b

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