Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcc7d5e9f54af49…

MALICIOUS

PDF

75.7 KB Created: 2021-07-06 15:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8245e1373ab47dadd8a57b16690861ef SHA-1: 3ca020237f6b5d57e097a002c68c52e77dfcd9e4 SHA-256: ffcc7d5e9f54af498060a596220d019fdb175c1aa0ab8b1cfc9b81f96f9f1ec2
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 WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/17702506546.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c41d730a---nazuvoxebekopaxevujugawu.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d950297e5---11777660881.pdf
    • http://nowyhotelik.pl/userfiles/file/pafoj.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2bef2db4---70493478752.pdf
    • https://laptoptranganh.com/data/dulieu/files/77278135746.pdf
    • http://yjsyrj.com/userfiles/file/26392019568.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/n3n29uakc11d85k1m1khnia8k6/87494160788.pdf
    • http://fashioneducation.ru/userfiles/file/valozozidogujedegodafu.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/66a45e2720373480662f7ddb58601924/gezesejebuduwasupeju.pdf
    • http://biplano.eu/userfiles/files/34857345596.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8d535afdf9182b84ae0762eb3403b0e3/xiderexirupidus.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a77e9af---wevalozepabapibel.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4405bd4a---45262720886.pdf
    • http://pileshoppen.dk/userfiles/file/lodejosidepalutukugakawez.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da7c88f1a62---kiraxonu.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/33066768001.pdf
    • http://musorcentrum.hu/files/article/file/diwudegurakuxuramuri.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a9b68d529---jugapofalokakunewiza.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/62041630904.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096caafe6101---10469064371.pdf
    • http://chukgoobok.com/files/fckeditor/file/47124257548.pdf
    • http://soles2walk.cz/data/file/getorivakijudov.pdf
    • http://cn-junsheng.com/upload/file///20217523101830.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=power+health+related+fitness
    • 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_off0000c6bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 16792 bytes
font_01_sfnt_off0000ded3.bin
e4450b493e020cd845131fa0c89cb9574a8ea1f3c69e7225e8e661664aee5f28
pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 10540 bytes
font_02_sfnt_off0000f6d6.bin
28a8c677cb73bf4e96122c982fb971164293e0245e99b8a10b047a7de65002ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 16648 bytes