Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78ca0889514d305…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 04:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8b1ca0b2f3206f2f9cfc3e46f180e5e SHA-1: 4405458a91d9df8ea25d860a2b8ba795c4fa0d38 SHA-256: b78ca0889514d305d466a888a8265d1e37217b738cc38815b2e2314d995b1f56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs further supports this phishing and distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b23500c0834573bb0f4707806bb0dcfb/31463960072.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a35b79960---figoti.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0459749d---35025130802.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ebfcc5efb---51146646645.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/rusodiwirekut.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/55922784669.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/rozibalalewanigunuja.pdfIn PDF document text
    • http://suaups.net/userfiles/file/58342905838.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/fegumirasawotado.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e5d0bb4f3632f8c1c00320622341a25b/63696555925.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/45298755352.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/81242130017.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a25c4d54---tifinusogekazuwavekogija.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6ad8774f9---68542562939.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/jizevowevixuxafuxuxiz.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/49422011860.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/65639942323.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/80061688120.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210902185501_412851214.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/105b2bc9664363111e6d3e3121954f26/59889992697.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/58504356221.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e641b8503f2---rulusi.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/dejurutunigo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ab3c35cf---kipaxewugufiludubivufife.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zakarixaxusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=steer+by+wire+technology+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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10984 bytes
SHA-256: a26ca36784721b5d047412f448cb3335a3b4dd184399ecfb9a8736c5961e76a1
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 17928 bytes
SHA-256: f1be539a18786ca08586dc9ff697255c5134d908029707ff1670559619a77b03
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1