Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e82c095da4e3dc…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 10:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a6d1b95c7709f16830bbfa1204dc12b SHA-1: 63f8c6c6255aaae458c1a4bf8679e132d8e985f5 SHA-256: 17e82c095da4e3dc4ef92bbbf4c78e59787ac766c095afd8c352af4aedbdb7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being flagged as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=fs+18+apk+mod+download PDF link annotation
    • http://fairway.cc/images/blog/file/gexedebubarabifepirataje.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210907113101.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e491cb7d9---bisubogaz.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/wujibovetoge.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130becd61c33---34447859709.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kiburovisigazunetumene.pdfIn PDF document text
    • https://almavilag.hu/files/files/gasuvikekegazomag.pdfIn PDF document text
    • https://andhimazhai.com/images/files/86475422628.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lalezakaredoxugavegazaj.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/99230650109.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/30271769742.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/80004138887.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed133675f1---sapadewipugelesemawojigot.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/kimulewogaxizoxuwixawuwi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dumevuj.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/63051254507.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/gobazonobik.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jepegak.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/ronumonanasafivusilavawe.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/sowimitev.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/66898589023.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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 17416 bytes
SHA-256: bd463e6aa55660e8181ac07a07fe93b3c58fd36ad56aad3aea2ae4d0fdd49180
font_02_sfnt_off00010eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 10544 bytes
SHA-256: a6bf0cecb117ef974c96f6ab5c155f5361430de88b48a056c43af356710de611