Malicious PDF — malware analysis report

Static analysis result for SHA-256 caefb3af212c3c3d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 07:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebdf276776795fac3831e96a3c4648fc SHA-1: 080e4caaa481e4967404664ebfb29689c10c7a8c SHA-256: caefb3af212c3c3d61d43352c425f74c37e1b69d5e4409628571ff14ff8a6341
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers confirm its malicious nature. The primary attack pattern involves redirecting users through these links, likely to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://aletihad-group.com/userfiles/files/24959470292.pdf In PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/14965213099.pdfIn PDF document text
    • http://chemicalengineers.ie/images/98666732899.pdfIn PDF document text
    • http://birdwatching.sk/media/file/94002562382.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109030418283936.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h7a41asnqnh1ps6ci6erenierc/dafetidojowipese.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gf90etc983fao22vb14ml3jjfb/18233480102.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58922246829.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091518225318.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a16568e1e5371b2ba5785f1708f56706/wopifaduranejupigovoxep.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139deaa8848a---43184178168.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/70361723105.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614672ad41ea3---65282416190.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/20704026794.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161340f3feb5dd---kutosuwixikifipinamazap.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/26285883720.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/3348824467.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/xevudewotedivud.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7mhd84hnst7jg89fipf1sqj0e/jukovufibinujijafofele.pdfIn PDF document text
    • http://aminotp.com/upload/files/70314176566.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/luvozawuwasafofamelami.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d3df36d---tisujovofetowuzalosazexe.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/fawodezolejabexopi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/duzogoxigoredujoxirep.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/jawuda.pdfIn PDF document text
    • http://goldia.cz/data/file/85782716520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=brgy+176+caloocan+zip+codePDF 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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 17836 bytes
SHA-256: 579796de03ada27da5350462bdfd28a5f0e9ea5f813fae1113e73309775c7852
font_01_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 10920 bytes
SHA-256: beaef10391ba8aa31d2042bb627c1d8a5e315fa96b6205ce201c9e63373d8f03
font_02_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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