Malicious PDF — malware analysis report

Static analysis result for SHA-256 886835f6be78672a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 18:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38e0c8f5fe713885c9cf771c74ef000d SHA-1: 02612d21850f1557329ad9d9f6194d4928d381ee SHA-256: 886835f6be78672a398e0ea9d9d2a0f2e0b14f6b2d3db2f7a1bf259af17c780c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=best+lan+multiplayer+games+for+android PDF link annotation
    • http://dallapietamarchisio.it/userfiles/files/2530525710.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/vivufivenu.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/xezitevu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136de7ac1705---58638172234.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/7495610967.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/34815350562.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/rigex.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613395a497b58---89287678040.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/rerebesoritewolal.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/rurososebodutapitubemi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e988b2eb41---sutozubefol.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/80708096262.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/44e8d7cc28bb43790608f2502bf50d5e/latenurudulowun.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/71f10ae8c2bdee061c9adb5e35084c8b/70512785340.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161381d4e79ec5---99044606709.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/95799406696.pdfIn PDF document text
    • https://12shio3.com/contents/files/92195268461.pdfIn PDF document text
    • http://torgoborud.org/images/file/regoguzewikuvowi.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/teporazebugowibur.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/buzag.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091416511143.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/98137051873.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/71f5dd6ef33f0f3e341f43cec51ecf60/wixabebarozokutez.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ccf244c3---zavawerir.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109121018554294.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/96657095889.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/20329358207.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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 11108 bytes
SHA-256: 8c454294c6a561a68a0dfbb85c33bf8d29ecf1312db0f757f31300c781e65aa8
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 17484 bytes
SHA-256: dad37041ed0892d57104870f3b50ba5fec7e6206db95d1a6a8b88677e278e8c6

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