Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdad8d406f7c3dc…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 18:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e0048fb05110fc423211712af48a9a9 SHA-1: 5ec03f2848ad6e823bb7da34878c7455cd2bfdb3 SHA-256: 6cdad8d406f7c3dc05b056fb05c10e4ac597f8e4853820c3dbca09c0dafecf5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML_NYX_PDF_MALICIOUS heuristic and the ClamAV detection strongly suggest this PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=can+you+play+yandere+simulator+on+ipad PDF link annotation
    • http://dfwsedan.com/nbloom/fckuploads/file/11695717474.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b259a8bd99---85040454642.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/lorevasu.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/lefizijisomatiso.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092219370654.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/37123035814.pdfIn PDF document text
    • https://yifff.se/userfiles/file/22955502798.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/54376042534.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/kofatoziguvorovefiperidok.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/robujagidedunuxasaximuji.pdfIn PDF document text
    • http://regcureguide.com/files/files/fuzafavazen.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/2b9a105c7ff43e9632033f6971a72b27/negaju.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/48290329509.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/sowujonatimepil.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/78346375084.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/kekajowuxisopuwajesuri.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131da2d9e3ed---62914306822.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/zomuzolikifasejadadeve.pdfIn PDF document text
    • http://glassick.com/userfiles/file/19832779178.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/42270791315.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/10579346044.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/kedebaribewenesaguf.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/jodonafarokorakimukodig.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zowepunuwevoxu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/29377608878.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_off0000b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 10796 bytes
SHA-256: c342f4bb151be274ab9c87afb4121b1ad978c4e76976e7bb6dab1cd6308b0095
font_01_sfnt_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 16952 bytes
SHA-256: 2ec537448f7174452115365ebcd4342c136c71ae8c62595df24979c6dd7c9cee

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