Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2527ee002e99d68…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 14:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba31f21741014ee00fdc9dba6087ca08 SHA-1: 42d2b3160397566a882f445e932cc0a561673bbe SHA-256: b2527ee002e99d6825f187e632ac0ff1feb21cb5e8ff7302cb1d0d4add72870e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests the PDF is designed to lure users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://economiadecomunion.net/ckfinder/userfiles/files/60317352891.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b07b98dd7---purivawuxemepotigipumoxil.pdf
    • https://samarpanbharat.org/trila/userfiles/file/4238725135.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/u7m198sked63a0daok1f2fmp06/34951216865.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/dokexuwijun.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/0i3u21gjmss410vr628d084s3n/92439902769.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/9h4kf96q9oi8ut9b3e7rffeav3/denitakenulakefabomijimul.pdf
    • http://vce34.ru/attachments/file/dobanalazezonirewezofediz.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bc78d6feb07a54a7ffc82419d9317a41/33540242558.pdf
    • http://hoacanh.net/luutru/files/2255771324.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/97277387367.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/97085a62bb94a89d8a1a22c5bf7bedcd/79381719612.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2997206bf---nalulililaxupafo.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789e44d20aa---wuzujam.pdf
    • http://remont-elektro.eu/archiv/file/jinidepomutezirojavoju.pdf
    • http://aczelzalog.hu/tmp/sagobote.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3f294d8d4ff3dc710cd75dee95920830/10536957626.pdf
    • https://medosojewellery.com/userfiles/files/52937021884.pdf
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/dokesuwirisuzunurap.pdf
    • https://papiratisk.cz/soubory/37426056552.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/3186403e5ef4456845e20e5b1ceacf1e/5203584159.pdf
    • http://tsg-edinstvo.ru/userfiles/file/35614207722.pdf
    • http://iburgisidimarsala.eu/userfiles/files/24709773192.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=3399+aed+to+inr
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 16792 bytes
font_01_sfnt_off0000ef0b.bin
fe3c16ece580211b025ce4ce0c1c3fbab40326707d57f252e3fcf0e3e3bc5a53
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 16788 bytes
font_02_sfnt_off00011953.bin
93f5eb80a3bb93b04fce512d0349519e1c6c2a5c00fd7f66f30255e18bc75e92
pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 10272 bytes
font_03_sfnt_off00013081.bin
cb22297cb345efa2b973a5529f7d34f362c2fa401ecec879e64cb16b1dda6a81
pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 16300 bytes