Malicious PDF — malware analysis report

Static analysis result for SHA-256 b881103b16567a07…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 10:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 426d1bcf4a4d7cb1f7aae5d54e658815 SHA-1: bd6f6e12de9de68e6808c1c64ec628e0427e244d SHA-256: b881103b16567a07e45dd15202268cac46fa8fdc308371a9bbc0d7f12368620b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to potentially compromised or disposable hosting sites. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure to trick users into clicking links, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=small+size+emulator+for+pc PDF link annotation
    • http://zenithmetals.com/files/xesodutakisubij.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tosepafowibuna.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/50314471200.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/viwovenusepo.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/7905780398.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mokolerezu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/69939583575.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/92495626392.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/fisokulobeninemilizuxuzom.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/78558688009.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/66592818247.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301cab06a83---39567646880.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/32657173125.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/76346333958.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210912112154_531958629.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/57977713888.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/biliwowokavuviwuwu.pdfIn PDF document text
    • https://novsport.com/content/File/wusofanubirarizuronegoloj.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/df0e7676e4fa79648e323942b6ea7320/guwigudalebap.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/64599163692.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/41614949730.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/42701153707.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207a9314be---9118067449.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902161214.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/wujuxoferazelesaxe.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 10772 bytes
SHA-256: 28c2dde110a641a018abd3581a210724fc2ad8ec110ffce9bfae89ae58ef3384
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 17268 bytes
SHA-256: 78f2d23e6ccd0e7555c884fdd34534211debb7ff294d86ca9db730e0c56ae37c

Open this report in the interactive analyzer, or submit your own file for analysis.