Malicious PDF — malware analysis report

Static analysis result for SHA-256 165accbde51e60db…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 03:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5190572761b7d3118c8e1b49ea1e188f SHA-1: 6749cabc273edd1e35fe56cded9308fb2afb1fd8 SHA-256: 165accbde51e60db2d08d198fb1bbb09b3f2971000daabc63614bd7ae6f420c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the heuristic firings confirm the presence of link farms and compromised CMS upload links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://irlanc.ru/uplcv?utm_term=top+five+largest+countries+in+the+world PDF link annotation
    • https://angem.fr/userfiles/file/zuzegovomixudebexowupu.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/73632809599.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/35003468548.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/wagelebovur.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f75075071---65111367788.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/7051945612.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/xiregudafoxel.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16149406d1b8df---10307195391.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/fopexanupamalibufafepom.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c44ebd9ab0---wureresamidufafemor.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/gaxibovepog.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/73960365290.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210920034531.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/48282165377.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/xemunugitelilasedituvi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2f19b9c7b---xutenivugipanujeposutogo.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/61474150514.pdfIn PDF document text
    • http://rcot.by/pics/files/xuriz.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/fofupinonadufixorikovore.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/kuralunapobetapumal.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/12872205255.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/27994957066.pdfIn PDF document text
    • https://virker-ikke.dk/files/pitus.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/15882461042.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_off0000aee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 14616 bytes
SHA-256: bd9088840d33fd80c61514812a60f44dcb236bcc67c40bd29afdc47f41843363
font_02_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 11112 bytes
SHA-256: 2f935eb57ef729ed6a6abe0b1624dbc85410853fd9508d5f93e48f00e85fae87

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