Malicious PDF — malware analysis report

Static analysis result for SHA-256 740f195a1409f3b4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 09:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57b30ebc0eb7763e36423c7fa6b879c2 SHA-1: bf1150588f90ec2b187f926ab0ebba20285fce52 SHA-256: 740f195a1409f3b418948b35e89235923cbe75ea61c674bb313e7f33f22145ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://abwingsbuffalo.com/uploads/files/tobog.pdf
    • https://jurad.eu/files/file/77730293690.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/nimexuratilimilajote.pdf
    • http://dison.cn/filespath/files/20210908134440.pdf
    • http://aisne.proximeo.com/ckfinder/userfiles/files/46697573153.pdf
    • https://maryamghiasi.com/images/upload/files/fawibi.pdf
    • https://iva-vietnam.com/userfiles/file/45285815138.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/93f5bff6ea43835c957d47c8e8bf76c4/zawix.pdf
    • http://dh-life.com/ckfinder/userfiles/files/46802785161.pdf
    • http://thermogroup.ru/uploads/files/kirulew.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/watunabed.pdf
    • https://daaeportrett.no/upload/file/rirurobepalotugitin.pdf
    • http://sushiyaslo.com/uploads/files/55562546500.pdf
    • http://papienbanana.com/user_file/file/larerokam.pdf
    • https://tcremich.lu/files/files/38146841974.pdf
    • http://automyjka.pl/automyjka.pl/userfiles/file/vimefox.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/12969151048.pdf
    • https://035620126.tw/upload/greenkitchen/files/66074927129.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e3f58afb---18475650497.pdf
    • http://uptownherndon.com/uploads/files/sagawulisujodera.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/luzokewevuwupowitovetixa.pdf
    • http://medrea.ru/upload/files/puligoxet.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7d288bf8d4a58e63cd015f5cc8e7c524/67462516264.pdf
    • http://burchiellati.com/file_fck/file/83714710794.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=control+parental+para+tablet+android+gratis
    • 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_off0000e10b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 16792 bytes
font_01_sfnt_off0000f922.bin
d201f8ecb8d1699d4eb246336ba28ba7e2770e58b8ec5d4bf8db12b0c042dbea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10740 bytes
font_02_sfnt_off00011179.bin
68a09f56bb3663810f883f027597786a7267936fac0993636ae57692fc73eb6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 18612 bytes