Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4cfcef1d31567a…

MALICIOUS

PDF

72.4 KB Created: 2021-10-03 00:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2336c5a8858788bf4ec7452e99b47e9c SHA-1: 68c5ac0108f1be32201eb721c804291cca75f8ec SHA-256: 0b4cfcef1d31567a5fa2f51b03fa9b4ae49d1a586c34fd03df7d73c3c789ae10
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dm288.com/slicice/file/79662155993.pdf In PDF document text
    • https://mokhalasati.com/userfiles/files/3276623879.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16151940c0418a---jegize.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kuwagagoxo.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/neratilasibipekesas.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/68611276364.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/98250810897.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/wavigu.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/285348092.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/13709484553.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/benatoxat.pdfIn PDF document text
    • https://fobh.net/userfiles/files/45584266850.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/xigol.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3971c0fd4---vodoleditoje.pdfIn PDF document text
    • http://konberdbio.com/upload/files/josogavow.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/64718421553.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/23056701604.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/bosorumerixuwinugebaj.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/tefowagexazixa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151d08a94137---70126091875.pdfIn PDF document text
    • http://canoeing.by/pics/files/93886709776.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/63746580482.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091718282177.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/65576993158.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/gazolum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=love%27s+gonna+get+you+downPDF 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_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 18488 bytes
SHA-256: 7c4a9a10f32b076e1f138bd7b3c21110fae920da8f82c10e3d1011216487b847
font_01_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 10544 bytes
SHA-256: 16c20e4b2071c63feffb82738341a9bf021c6f3ca7a7333f3ab503dd071ca39c
font_02_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1