Malicious PDF — malware analysis report

Static analysis result for SHA-256 4541fc62171267f7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 03:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 974a19818f91544c8e1d89771eae5874 SHA-1: c8ea21391eff14bfbf6239fc4b8461408bb72539 SHA-256: 4541fc62171267f78892976a810f227e59491783ba9a4952ca6bbf62dd0090db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm and the detection names suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613518982874d---36545200788.pdf In PDF document text
    • http://mywymc.com/userfiles/file/wanomerog.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/47729931632.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_132355.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccc77b99c---93731749545.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147947749f---28954235661.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/28771732016.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/16906217828.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/56838063818.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/zixinaduw.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/93660146266.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/71281652786.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/16010644614.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/72320034300.pdfIn PDF document text
    • https://alariel.be/userfiles/file/gapixusobikufe.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/kaketefeseretixotorasex.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/fajezasedenukinufumagun.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/rorofuduk.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/80845407844.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/tetorapifixaj.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/61147914788.pdfIn PDF document text
    • http://imbirimbir.ru/files/12323378953.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/53378086126.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/wabipor.pdfIn PDF document text
    • http://osayit.com/images/file/55431724340.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/kezewo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fdda07eb---9076957756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=no+limit+drag+racing+2+battle+creek+gamesPDF link annotation
    • 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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 11040 bytes
SHA-256: 772f6139f19510f588bc39c9c11c0a5367501aba1d259e9a9fa3f57e21c1124d
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 17988 bytes
SHA-256: d0745c182368e49a2b75aeee8186bd9ee663fe58e89562795e868980a6f10887
font_02_sfnt_off0001315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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