Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ac07218acccfbd…

MALICIOUS

PDF

98.0 KB Created: 2021-08-03 07:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a63a06a07034a0f19c66c7789e61591c SHA-1: 0098b4fa7c0b06c0c8d0f7279cdb48cb4852773d SHA-256: 62ac07218acccfbdc62fc85e7cc893605da6160f1b3f6e9eaf2b250fab7abef3
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaea526a51---mofakulugiwi.pdf In PDF document text
    • http://www.celso.org/download/liwelokutufepakin.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/83c321f5de2cadd86d55e19f26486e4a/tubugeguziximesovizugater.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26575cc2a2---16937223766.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f148850b206---45492984707.pdfIn PDF document text
    • https://amblamy.ee/upload/file/mimij.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/rexejug.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/fijusegerelajuw.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/14a4a965616dfad631900f558ded3834/3010000760.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/tt9bgkarbak8bd78phqck67gjt/26418817888.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087015fb3611---vifimulutegux.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pipuxuravamanusifo.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/kilofajotexebuf.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/govizodumovipujagogiwu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/98370384210.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d7f79b2c4---jipuf.pdfIn PDF document text
    • https://raljob.com/userfiles/file/30886989906.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ef480c1fe---wenanexatoxoxibitajulope.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4f1047f3c5624e0e08c08fcf5b35c60b/vunijazivafow.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de35f2092d---57561804717.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/zizitakugijiwozevap.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/argipntapc7r5a8cs072vnk0o4/62872036340.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vorefiguzezuratotitiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bosquejos+expositivos+para+predicar+pdfPDF 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_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 11060 bytes
SHA-256: d739bf3a06f0bdbf9dd666398861bc029dd04e82e52c11cc3746ceb98d82f688
font_01_sfnt_off00012f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3A 19304 bytes
SHA-256: bd941903e6897e6ba65be2370aad520b5ad174931aef78e4e2fae7221a5f2bee
font_02_sfnt_off0001605b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1605B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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