Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5739161c65ab599…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 23:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5dad550e01efe60f041f7ac9619bb23e SHA-1: 6933a049c5d7a5d46b3b9279cbd807a5a87e61e0 SHA-256: f5739161c65ab59909f8f0a4bc823834cbb2dbe632d4d48060e751af3b45e5a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript suggests an attempt to exploit vulnerabilities or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=reeves+family+tree PDF link annotation
    • http://ytbozhuo.com/upload/file/070321284996.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614188c4cabe6---janamodib.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sofafufefoxaviwe.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210908140714.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/44271154637.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/navulo.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/nimagifilegaselij.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/46646528216.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/xupadog.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/79212540131.pdfIn PDF document text
    • http://renknh.com/ckupload/files/sudilumikakajenujawiv.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/48348208690.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614e83a23476a---dogelusideri.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/46875514348.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/zejorudakodezavu.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/xexufozu.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/4427667435.pdfIn PDF document text
    • http://hainfelderteich.at/tokipafuzum.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/vulidaselasuwe.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150f44448975---97508357431.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/11933778428.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/12026489589.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-16/20210916022721204308.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/12835453865.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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 10376 bytes
SHA-256: 834a5c82d0a51d2327fdc3fc975c00f7328eb6eb000f713a5aeb6049c9c52ba6
font_01_sfnt_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 17772 bytes
SHA-256: e635b873ec7745604d00a80f37c258f41313c1c1eb5c9d7004b084c973b2a507
font_02_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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