Malicious PDF — malware analysis report

Static analysis result for SHA-256 a249487a4bee49cd…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 05:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9bc3f5c6bf68655d0679893384dbef3 SHA-1: e9bfecdc578ed3cc2dd5e8edd8d7a89eaf9c9044 SHA-256: a249487a4bee49cd37c53c1ff2f0a2fcbd3445a0e40a15b60d6e0de3dc0e0aae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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 https://akapacha.com/userfiles/file/85659374260.pdf In PDF document text
    • https://angkorphotographyguide.com/userfiles/file/dowununibulusux.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fazovefigu.pdfIn PDF document text
    • http://szpk.hu/_user/file/mutupe.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/93595020561.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/eea2a28e95cbab96d435f517920e7261/76325167886.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/46834311908.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/vores.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/fipifa.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/xizonu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612132a7c0e7b---zarotudaba.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210815074142.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/jonijafukajozumitoviwez.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/sepuzesowe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c83d22cad---zupejelaxumebopirasafiza.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e640e44617---tavirefagub.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d728bbf6c---semosegodapolobemobufulo.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/33665697063.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/kokakalivije.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a552472c1ad---35075322247.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8861105b9ec6d9de60fdfe062a51b691/xepegibamawife.pdfIn PDF document text
    • http://yoron.net/up/files/78415827902.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/zijew.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/5546574833.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04e7b630f5---36192318932.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c517b97ec---70795810467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solar+panel+installation+guide+pdfPDF 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_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10848 bytes
SHA-256: 7f6f18631ed2bcadf471d42c1ec59f86770b927693f0efcb32398b8455d4703c
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 17012 bytes
SHA-256: e12211bccaa97f55502464b1cdc37bce0bb9ee8fbea29cfc2ad5a5e4f667cc4b

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