Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b9302df53ae7e2…

MALICIOUS

PDF

85.9 KB Created: 2021-08-15 19:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f5174f1ac54025114f9e629d12e14127 SHA-1: 914b1431d2ccbbcb0323fff75ce80f94202c3070 SHA-256: 42b9302df53ae7e295cfde553d00336c0693943b8619c51c0ae62cd1989e413c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a link farm pointing to various domains, some of which are compromised WordPress upload directories, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of numerous external URIs and link farm indicators strongly supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://iphonedown.com/ckfinder/userfiles/files/vafifeno.pdf In PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061713343673499.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ceddd9d653206d089b9658cbef90cae1/38586986701.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/794675c5ee6e1c271b0431a085484ffd/87274263232.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161055af6b582d---15426039515.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/xazurez.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/valojuvowutokogutugor.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608860ece04a7---donapodexexobakineju.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/25512648740.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/5884405968.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/wepubepebuv.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/53966a12106c6e61e6a744c49056557e/gekuvikexuresuti.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210609051102_1750885716.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sivanamarisabomis.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/94038097957.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/18dcd01ed285e7d42fa16ea1ba190be7/boterepavilapaxovi.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/titiruwubex.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/winuk.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/fd0e329b0064fc3b431ffe8995c1d30a/75471980313.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0d34a879---4580040377.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fubupotoluxetire.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/93151567903.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/lumimiduzepikimederoju.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a4048202---55657524607.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/gemafizuzeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=geometry+dash+apk+full+version+2020+mediaf%C4%B1rePDF 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_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 17164 bytes
SHA-256: ae60292c301567ac3ef3f190ed1450a7b444bd9e36c00d64c7e7b646ca63bb78
font_01_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 11464 bytes
SHA-256: 5ebabc15f44597b03c7c9d32a902f3579c3f936a3e9d245f373ff1bdef16920c