Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1cce6187917820…

MALICIOUS

PDF

90.2 KB Created: 2021-09-05 10:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c79827abe1168cd04f5c7c6a1e9ff187 SHA-1: ac4e918443ec0e497f964bb830af83a6542c4920 SHA-256: 7b1cce6187917820b67fa45fa1b6793816873d0ce4033415c7e31e892ce3eae3
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 or disposable domains, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://globalroomplus.com/bot/ckfinder/uf/files/85681975060.pdf In PDF document text
    • https://lapalettedesarts.fr/gestion/file/35750326584.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/25171510717.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/88233782027.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/81372699728.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/tobomibudagamomepomib.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pegagawutigi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c5be5a83c8950a79e3fa37e5d6ee24f9/filafujipebapafuririfiti.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/37723642524.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/21512911198.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d4m0e63ueleccvrtcm4chvevi5/xupefitiwuguloko.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c32a627022fe3004771b2d25e38c77e3/18360733228.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612177502bf4d---58811583033.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c31351ed9---91212176504.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nepajiwalazajovomipovosuv.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wefedoludoro.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/wusavizosijerikimuzisela.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/kowemevinozetet.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/iaj1srhphasuh9rk91o42oe3i8/50050203242.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/piporojotavagubi.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kasakidot.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/jofipaleluvuzukikatoju.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/82925562413.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0507ef68abe6b54eb82cec63cb801df1/jerididadedipumegokoxima.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/14467069040.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=law+of+conservation+of+energy+problems+with+solutions+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_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 18852 bytes
SHA-256: 4e4f5aaf5a7b1534b22ef8d797c9c367507d3cb79d44ff33feb19c3a2d2d10b6
font_01_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4D 11532 bytes
SHA-256: 2a35499188b898c685b2b4430a1c59cebeb447a1712f32c952bcfd52b0b58551