Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef3056931eb00a0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 01:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14a252904a09201b67867e9c2cf620b7 SHA-1: 09b07999fb7bd0f18f4f944034e97cf2194d75f5 SHA-256: 3ef3056931eb00a043cca039a374e00c1551e994a4af7d3eed57754185f04908
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://blessingsngo.in/userfiles/files/buxonefivopoxinudixog.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613965885d5eb---64441441692.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/1572728968.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/84981962786.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kaitu1bjr74k5dokq00l3m2l6v/taketemowupalotuwisosasa.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/53229980600.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/vavivisexupeguzovudezawos.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/totugisajuzivanimof.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/84320314013.pdfIn PDF document text
    • http://apart1day.ru/file/lutuvigibolo.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/58972066556.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/ziloforatonorowimojimamu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/03lcrgigja03ke37k0af31r0u1/juduridibenusikaki.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/88825132859.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/gibepesifal.pdfIn PDF document text
    • http://gerocuki.hu/user/file/54081505649.pdfIn PDF document text
    • https://coevent.ru/upload/files/loviramazegewem.pdfIn PDF document text
    • http://haphadoor.com/upload/files/forisevufuzedavag.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/lenelabadadixajakusi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f69f3f1a0---28400159467.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/17380671914.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/55707458372.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/90639263758.pdfIn PDF document text
    • https://mbbs.hr/files/2298397232.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/bonoberaxilurivanul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+earn+coins+in+pokemon+go+2020PDF link annotation
    • 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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 11080 bytes
SHA-256: d0d0edbe2fc1d64902585b42cab67aed113d1841189d0cacf10140f1e73a9181
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 17592 bytes
SHA-256: 4676cdacb781ee0f692308a03c4583a906fc5aff1dac2d5454b1107a147b6a09
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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