Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eafd77d275fde44…

MALICIOUS

PDF

90.9 KB Created: 2021-06-30 09:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7df42dabc45ad9bcb4583c80a1c4d724 SHA-1: 000e7e629ea78cd492dda0c77ef5d4d4854ad4f4 SHA-256: 4eafd77d275fde442238c5357b1196c0939aaabe3f284715835c785b58fd46d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://lamelove-zakryti.cz/userfiles/file/74390904620.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/24c8e3c0121b32c2648e2330fe4c5df0/vafatolepimodezarogamofe.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/vuj2ms4bpb5u40hm687o2u7d17/kifoma.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/m001oiktjruagt6k56hqj6gtj3/wagipepuwinepuwitenik.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/r0hlosjjp6afe09oe24iuqhral/57151137567.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e0958d5829266a82dc1f574294d353d5/76071019378.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ukel6rpckk0sa0orja435lmgqc/72075544193.pdf
    • https://designclarf.it/file/74625479284.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pixexerogefejepesobosil.pdf
    • http://www.contal-farmer.com/uploads/files/sotobefunamir.pdf
    • http://vonschickenconcord.com/uploads/files/rojupiwa.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/80640569653.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3fcb363f9d9070eb1de02f454a79154c/51613171570.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/subesuwafataxidenijovux.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfgq2gbk6p8rlecgrseaobgav8/9318233171.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gdao96rqh12q3m00k6gpqc6qj1/mumowopawevar.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866011d6ac---98790000626.pdf
    • http://inspirationforexcellence.com/clients/66491/File/sezoberapewepexinokode.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29573ad9e---95659533583.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01805ab8b---32942986285.pdf
    • http://clubmaniacr.com/campannas/file/wazinapokojerutabuzomolu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=words+and+expressions+class+9+solutions+unit+8
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5e28b7a2a46e6fa22aad83b8487918e3/38982220853.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b9.bin
a7234ddee2aa8635eea78689c911ba0ccde936b45405d10d753fa47803427c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 17388 bytes
font_01_sfnt_off00011609.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 16792 bytes
font_02_sfnt_off00012e1a.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 16144 bytes
font_03_sfnt_off0001439a.bin
020bd51b2f9a5d09fbb9149dae2b177e878a487e41f15330f8151058d98b796b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1439A 11076 bytes