Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc003d652d4a5e1b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-22 17:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2458721ae63b72968ad4556f523f1726 SHA-1: 9d020efd294e394ce571f1ae14401c9ea7dff586 SHA-256: cc003d652d4a5e1b672a94c73ef8f6b60fc2b15ca44051447a4ef7587f85d40c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://jagodkaprzedszkole.pl/userfiles/file/jupolefelu.pdf In PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ggcona6m885ijfmeei5gve7he7/tixenomevekogetitif.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/36962034330.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/rokarazagalifenorix.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/viwijudabinixorolune.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142272705124---52918157728.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/fokolorataw.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/selovetarivogexorerodi.pdfIn PDF document text
    • http://marine-inox.com/i/File/gijorugijum.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/gupepoxudi.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/46269312027.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/werajebabilunu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/992f5fe1de05b652ab2834e1544050ac/govulifowapiwanetegola.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a3ad2b07646bc62e7f6f0a827d873c9c/baruzawutudafos.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/14394311272.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/pajegagijutikine.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/2169890812.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726dd4f43e---zanazudurusotilexizof.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/vobeguzekuxesuni.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/nepipovazezesikigorofugot.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/josilefudezinudadifuraf.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/78375988335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=joey+tv+show+streamingPDF 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_off0000bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC9 10764 bytes
SHA-256: 362878b821f0ce1db728d612e20aff621c90eb9aeb4deee77605822ede1b1660
font_01_sfnt_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 16692 bytes
SHA-256: 86ce0d4d2dd192592c7a05b8aca1d53a42e24e657b74af11378a490eece52d15
font_02_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1