Malicious PDF — malware analysis report

Static analysis result for SHA-256 513254fad7e9968d…

MALICIOUS

PDF

96.9 KB Created: 2021-09-03 06:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b974d5286678a5d101fe76466b181b5a SHA-1: 7dac63fb6f785e9fae9daa40aa21b5bfd84a50f0 SHA-256: 513254fad7e9968d9f3d9be2be08cf8acc94308b52d81ed5f8d0461d5929c01a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://iva-vietnam.com/userfiles/file/kefugulobibevijipowurog.pdf In PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/12595325944.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cdb3d5df2---79301687537.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c44260197e315ae89ba211a261cab9a5/30779501440.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/nawip.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e3944312f9b---15790869846.pdfIn PDF document text
    • https://limsurempat.com/contents//files/lowaxamupiviv.pdfIn PDF document text
    • http://potlista.com/file/files/45782450136.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/bivitobezowunedipitaxuti.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/86713336125.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/92e36de5a64fc305e137ede78742a291/nutovepusifu.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/23800061062.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf29eefb9---konorezawof.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/musitosesik.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b374c819db5---10014829301.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/11/vefedoworazuronidupadi.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/domosotoligir.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/93716805414.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/gidugamuvuwaxuvupofoxuv.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/fifijawadabixaji.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xaxevor.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/davoxobivisuzozok.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9pla0o9pd8a8maa1i28eopmn83/43217133740.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/nowixitemaxowo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/26571511606.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6341428bf32377ceaef75afdb7dec52f/xekufijotakobelej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=deathwatch+40k+codex+8th+edition+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_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 11092 bytes
SHA-256: 243fb97bf23fe7bc3054d34df90e104e2c4b5f9cefe84de5c85bbd5a3dd31a9b
font_01_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BB 18532 bytes
SHA-256: 0765143e24d4d70726e4076a48d62a442e7d60b6047d7025a16b56035226c249

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