Malicious PDF — malware analysis report

Static analysis result for SHA-256 becff5ca8389b7c3…

MALICIOUS

PDF

97.7 KB Created: 2021-09-05 18:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41d3d663dea6e78b652a5627663a1d91 SHA-1: 073a6fa190d1ad1805f6487abf16c7fb234cdf5a SHA-256: becff5ca8389b7c3f618d88bb20a3a27490be2e051eba87f82b70f00e5c5f1af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a phishing or exploit site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 7

  • 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.
  • 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://nessium.fr/userfiles/file/nepafujax.pdf In PDF document text
    • https://dineflon.com//files/17623649002.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/79802594760.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e4dc6d78a71054061b50731982b523b7/19158145613.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6fb7a0a6b068c63a0e365c2d49ca8cf5/45714329645.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/847129147.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/25884047510.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/58818873222.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/nijizafozovosefa.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/40240983248.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3iqgu0igaapjf356aohijosloc/godetamitoziwogufebe.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/6907565706.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607952980f204---25461290339.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/fbf1ea245bbab804b82ecfe45109049c/64676772391.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/virufibovimiwirefadafin.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/12794945564.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nhgbmocc0hic1eslal2kh3543d/najenuletekopasa.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/vamazopu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8656f9a207e5244193d23b9e334683f4/76436343875.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fatetobod.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6326a09a573978c08cded5f504a81de3/36339496697.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/33357514736.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/h63nklldeej691akrrvnk6c8ha/matawopixivujigotix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=women%27s+clothing+pdf+patternsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 19420 bytes
SHA-256: 1b278db68ce743715c8698944564112023ad65ba413aff55137169d61f9b5bdb
font_02_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 11096 bytes
SHA-256: 2ce71fb6ab48c79093c68b9160bd27d844ad35f54735a9ff7c1ba495022f6127
font_03_sfnt_off00016311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16311 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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