Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a7acdf08771199…

MALICIOUS

PDF

86.7 KB Created: 2021-08-11 00:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c3371b7799f80b127fa8669112111b8 SHA-1: 40d34f900fe97b72cdb39488e3234e29a2361bb9 SHA-256: 36a7acdf087711997355a89beda8934dcb270523a215ba4152e59d8b2e350c58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://baloneacessorios.com/_upload/file///70389212817.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/10165675316.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/jejepo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3c9520be6---neramupo.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/kenotogogiwut.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/79229614723.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/dewoduwujixegukepowavanu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf34368056---xivikibitivopanonep.pdfIn PDF document text
    • http://abwessex.com/uploads/files/nefevapeme.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/movafasojanopenojarulovuw.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/64193807520.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/kewipik.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/78a2a487776a57ed48205a5f99310f3b/xolowuxidarikopelebelus.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/74c03cf6852c0c8bbcd234ab1cf5a72d/difuve.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a947596c78f---20663562473.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/29959090029.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/71776381430.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0205bbe8---lozadiwizoxatuzolakemusi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096d342cba38---rekoxunoxelerosevudu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c06cb21e---90356348837.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/58697529157.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/38672549135.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/41654967285.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/91860766024.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c1874a76---26714335189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+game+euro+truck+driver+2018+mod+apk+3.4PDF 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_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 16676 bytes
SHA-256: 3bfdf28db7816e3c6b22a03dbd2add1ab125d0a103f3c59b099b779d7298fbd3
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 11852 bytes
SHA-256: 2d0fc9bbf7a35f54892144fad921cdf2cab35fb7628da2df207a5f9283f9c019
font_02_sfnt_off000133a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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