Malicious PDF — malware analysis report

Static analysis result for SHA-256 697148270306b8f0…

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 19:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6239b36c1b6101f4bb54f90e0f64829d SHA-1: 88fcf4489f82bc8e5133a9fee6cba116a5d42b7b SHA-256: 697148270306b8f08010e06fde843b4868a0a217ffc41eac278578f21b530c63
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute further malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://fotofolliasanlazzaro.it/userfiles/files/39226671367.pdf In PDF document text
    • https://fullgame.hu/uploads/files/69322126275.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gikudaruza.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210701171419.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/jivuk.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/73b8b1603a68cdf68599c1c82f55d991/61468983408.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f4288f58ea6f60e5451edc2b605046c2/72565060903.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/30utb2fglssmotrjigd6c96jm4/gebakepawilur.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c9f18bcc---94531199393.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079dcb72e1d1---favomezosikiw.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/40230208192.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/tusopowez.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1001c619610e977392ee1631eb9b23ce/5376284480.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/mvr036v4ijerv7phdg15vsfmn5/21485686601.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/murufobotimex.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/35v9nqlr7q66tj1d0spk926io2/zapekilov.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/29368210803.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5b256e40b4b3efc9b11f8b09d9c39c8f/busarevepijapusugeja.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/tirirasilolekojojozu.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/24727275533.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/b63e5985256f3c1a08811588f43763c6/10845667877.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/jibajivuwabijuzoruzopa.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e5357b29142d94253dbd987108c5909f/seneka.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/44027352596.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/27987208722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=stopping+a+broody+henPDF 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_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 10788 bytes
SHA-256: bf918b9e4fa255fce81b9b8e665fb50fa98b4267c5758bd1de339f152ae7ee64
font_02_sfnt_off00012abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABF 16780 bytes
SHA-256: ccd06c7ec3d1af762609b03be6017f501e6c1a75af6b0925d938daf4c8441fbf