Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7edb257ce4f1c4…

MALICIOUS

PDF

91.7 KB Created: 2021-06-26 08:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50a40afb4ead878739cb429f019f2c67 SHA-1: de27236ec09cfdb79ed4afe97b9c48ee137faf5c SHA-256: 9f7edb257ce4f1c420b832e83eba52c99e6f582192890a9d7e40f6ca07a008f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and link farms on disposable hosting are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6895374d6d---gadupaxikaja.pdf
    • http://terezmisszio.eu/files/file/xapekogimizon.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f6205b132c2b874f25bccde62bdea80f/42875013772.pdf
    • http://fatamorgana.fr/uploads/assets/file/9008615024.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160998ef62d510---bitinosumubetunalunefum.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b9f95a10cb0a0bcd89f8692a793fb663/jonafune.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/neteb8qomol5vkm68fvcb6f5fu/68834552961.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075626cb7d01---47258854.pdf
    • http://tetraeng.it/userfiles/files/donenusesizofomixova.pdf
    • http://hrudolf.com/userfiles/kijijejesiwawawawe.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/muwewisapejukepifiror.pdf
    • http://dinskayarealty.ru/media/file/kekobagukomuripewixigozo.pdf
    • https://eobliecky.sk/userfiles/file/megetemujajapubosemug.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160887af5d970d---natexizuluvuzijibugid.pdf
    • https://hashtag.school/userfiles/file/wipadafawofuzode.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa18edd848---desebarigego.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098774d37eac---40902302545.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/59l8bbp8sdsa28fc1o8ova10dt/dovarimusul.pdf
    • http://creptiles.dk/userfiles/file/99354703941.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/fec80d425f236c5f0ceefcc49ef6c233/43275192612.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/daliwuzadebepejazorux.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/tisixatupapesijopisepu.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086415b545ca---kopul.pdf
    • http://bearings-home.com/userfiles/file/61688171259.pdf
    • https://majorsagilekvaros.hu/uploads/file/14664826771.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d2ea8f61---26842816110.pdf
    • http://paillasse.hu/userfiles/file/pegijov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=apa+style+abstract
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001027b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 16792 bytes
font_01_sfnt_off00011a8d.bin
f0804f4cc928c4c5fe48ca763bbe4bd24354c93c44b93af437813a94507ae6f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 17612 bytes
font_02_sfnt_off00014892.bin
356f6195ea8c12df98f57d480858aeaadccf653801bdf631c1918e6b2cca8626
pdf-font-stream PDF embedded font (sfnt) at offset 0x14892 10284 bytes