Malicious PDF — malware analysis report

Static analysis result for SHA-256 a435a88dd2dbbb01…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 03:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 363f1a2999dfb32eeaf65a45708e99af SHA-1: 72355b75890010b44bfac7dd634b96279669d141 SHA-256: a435a88dd2dbbb017fbff9389d739782528c14b2313abee588d98b7eb429968d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document body is unreadable, but the presence of numerous URLs pointing to compromised CMS uploads and disposable hosting suggests an attempt to distribute malicious content or harvest credentials. The heuristic 'SE_MFA_LURE' indicates the document likely prompts for sensitive information such as one-time codes or MFA approvals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://huntic.ru/uplcv?utm_term=flagman+training+manual+south+africa PDF link annotation
    • http://xlsferrosilicon.com/d/files/mosevobubapoxul.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wobesiriwi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b521403b2---31274796548.pdfIn PDF document text
    • https://haidangpc.com/contents/files/91182314840.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd84986cd1b---naranenanurelebufiwafuver.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/993fb56b702c03466de63c5aa502a4eb/58445344826.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097358d95429---95881569063.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/tdpo0u07kuuvqgpt7o17clvmqi/81047957803.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/stb7qqqq3rrqebiigm81g26bju/vopekixez.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6f9859a7999f589034845addc0fbc48e/narazedaxekemebolerixewu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429200213561742.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b2a47c91f64dccfeda38bf1412206d80/21732093380.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c777fe19cf2---29014196326.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/90jombtu3m32e8su3m2itf4o33/63368004630.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc27e0ca2---6166744623.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/52392376681.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/wezamipulovu.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/33859795376.pdfIn PDF document text
    • https://o-dance.com/upload/files/28607170243.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/68663688642.pdfIn PDF document text
    • https://gdaniec.com/upload/files/15751732699.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6055cf976d2b1ffb7a5a5b0572a4ed9a/liropajuposisixutijaxav.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/gamuvodilofiwi.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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 10728 bytes
SHA-256: 5def059a79a3051740a8f5c246e4ae1677ed60338c6f5a2530a88e77bba0056a
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 17456 bytes
SHA-256: 0dfbffd399279b23a6f0941ff3681ca1e5f27bc150780c5afc21eb24d4817ed5
font_02_sfnt_off000135bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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