Malicious PDF — malware analysis report

Static analysis result for SHA-256 6555f5749387501c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-20 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b925cd87fce0c2ec8d3d79f222f03f8e SHA-1: 95ffe7b65020b2bdc2583559a26845b880e63d4c SHA-256: 6555f5749387501cf8055b711a87d0b717ecab4eec6274a6c97138bb7ba89f85
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the overall structure strongly indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://paklya.su/design/img/upload/file/gimidimizegorodo.pdf In PDF document text
    • http://olympicburger1988.com/uploads/files/wupunedirarugipamurad.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084da825b63d---dejukifumegugibu.pdfIn PDF document text
    • https://olterus.info/contents//files/nigokexowulipukut.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3c045da02bbc4febc0bc5e3fffe54754/83942770316.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/kexilumeni.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/nitojujubirujuzepamuz.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/92fafcbc1951ec91877c41ac04777b43/63092340170.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/robogaxojujosudeja.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2194d403dc---61370854393.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/je9uje9p3i8njof1f913147ev2/muzezafabalomim.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f729f86d7330e8e86818d57c52425aef/31173443811.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5376fe46d22d10e293d4b8a7a8a4fdc/1706810131.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/51168286715.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436561ecee---monarivigujadonibupedik.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/wusazumosu.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/bumuravevikijofit.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afcb44a5f8---84003291080.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46fd741eef---lozunitoxomifefepex.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zatobagagatemokuvag.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8868313092---gujemuwelogikuworez.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/20628507628.pdfIn PDF document text
    • http://erdbau-rauch.at/kijafomemuxupakepexujata.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5449f5b31eb2ebab3b680ec538142360/41352742625.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/tigibo.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/61722259382.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/agubawarubokubusezap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=when+asked+to+talk+about+yourself+in+an+interviewPDF 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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 11040 bytes
SHA-256: 3c98fb82c6f84621fa796c87a3ef41fafdb93642cf9cf962dc74df807fb6ae8c
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 17468 bytes
SHA-256: d7c82d8daebc67ccb556ea8d920512fe5c0040ca12d2feed0c438a81a32a0b6e