Malicious PDF — malware analysis report

Static analysis result for SHA-256 c147459282ec48b9…

MALICIOUS

PDF

90.3 KB Created: 2021-07-14 05:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 339093fa3e8c4500546f2fddc574b5f8 SHA-1: 7b490b204f292d6fea5585f594e7320e0ad297ee SHA-256: c147459282ec48b911c4a101940fc9795119b600bf65fc0d211912cc6068e65d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://philabc.ru/uplcv?utm_term=job+offer+counter+offer+email+example', are likely used to lure victims with deceptive content like job offers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=job+offer+counter+offer+email+example PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/tapdshtf1tn36s363o5lg93al1/31635278480.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49caccda2---kojigowifubutalibexupil.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/93009421871.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tazifajojapotuxob.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/notin.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/jimabetegagek.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/43868179903.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/1527566753.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/33553046934.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3e693400---35804613149.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cad62afe---kutugogedupisufoz.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/1b18qe725r2aj145bq3gi1aavt/xijokaxolire.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_0A2FADAFEC7142ED.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd57d7d69---87339233774.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6529e5020---19230343151.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/54646446493.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d29164aa---dasisukekilebegopoxule.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e925ea73a1---nomejo.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/88649097169.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2lg8hrphv8rc59ijcsqkj9d8g8/92973194292.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/jazefugalezumudu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wexazekidot.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/11827821769.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/lokixufajujuvonor.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.pdfIn PDF document text
    • 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_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 10808 bytes
SHA-256: 7df0c1397cf7debc71bc0e9368a8452ec3889acd41ff8c0653c6677d1703128c
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 17104 bytes
SHA-256: b2e5754de5c8b77bb78e677f89020a826dca48e42d736eb868a057e6b72fe834