Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ebd1b860f2754c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 11:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06d8d6594006200559671f2d1ec48930 SHA-1: e4a54abf9949591275ba9699b1515e751e5ca2e1 SHA-256: 51ebd1b860f2754cf8c49329563c6cbba505d2ce66ab5018af1611211194b3f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest this PDF is intended to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://smidgel.ru/uplcv?utm_term=numerical+recipes+pdf+python PDF link annotation
    • https://tolgyesvolgy.hu/userfiles/file/44890621468.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/18109926708.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/23331071821.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/87816257628.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/21842608986.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/39929319128.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/5775739529.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609a879fa7e53---jivarusaviwewaxawiju.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/vesivapolepatapivasomi.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/xexafepiwelodisir.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c505e38745f0df611e47f86e9608bc19/4150587448.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/11776735744.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/31094957299.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16095da09624d8---12359939284.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077307ac0ea1---tinumemidalowofojufin.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610145cc9ad8f---91746878962.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/rebom.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d9eb7bf22627ec80de4741229322a74/mavamixemixekakisofup.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/daladeradulemo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c069c2b6c2f---68370811661.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/buvezidiminizuvexam.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2919f08c4e---mesakagu.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/29968344388.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/53849504951.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/46699059088.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 17200 bytes
SHA-256: e8f8e9bb854e5a5f876f34fe583847c83fbd27be58ab2e88ee6fff4bf53b0ff9
font_01_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 11076 bytes
SHA-256: b65801cccfb7519cc0283a8a93f2226cd8cd459221b29d7cdff914ddde0ea867

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