Malicious PDF — malware analysis report

Static analysis result for SHA-256 7328afd35d298452…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 03:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f58c9c7a764da5612d44d143bb4e1a4a SHA-1: 45d21637a35b56cc9cee75c8ec1cf7bd28b14155 SHA-256: 7328afd35d29845269f42c8444f0892ed758a9fb406c94138fab36865eb8d96e
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and exhibits characteristics of a malicious exploit stream, as indicated by heuristic firings and ML classification. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggests a link farm designed to host and distribute malicious content. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tbff-bygg.se/img/files/pubixeridajexuvifanoxuz.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090623572329.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161329fb740517---77062237900.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa73ebe9b---pibatekinevuvup.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/83880188047.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/93905109211.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10b9315e6---rugupinufupixapepobirepu.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/legizekelutukepamuwonom.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/44986371370.pdfIn PDF document text
    • http://lecostationery.com/files/file/wutalojusawu.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/vokebak.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/soranurilexezesuk.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/11957578563.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f655592bf8---zizeberedoveviv.pdfIn PDF document text
    • https://clubon.top/uploads/files/45483819611.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/potemutegifodejop.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/bosajuvawikomevom.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210913235243774968lf3tge.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/19528012350.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/20028828277.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/geduwazaxesevu.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vigewopare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=samsung+galaxy+s4+wifi+wont+turn+onPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/4039055913.pdfIn PDF document text
    • 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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 10980 bytes
SHA-256: 56b8e5ef1a3da497baa0454bb42f1956f3714274176c7ce81c8ec6079685f006
font_02_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 17696 bytes
SHA-256: 044cc6b0e7521fba93763e9dba8d86ba9dedd7040248a9784864cbdbd6c58860

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