Malicious PDF — malware analysis report

Static analysis result for SHA-256 847f1b7ae5d86ed4…

MALICIOUS

PDF

83.6 KB Created: 2021-07-25 08:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6351a1c3d6a9d8cf67dfa351e1f1f3e5 SHA-1: 7e00c71b922153efe89e36ca069bbbbc8e4dfab3 SHA-256: 847f1b7ae5d86ed4df0139e9bb9e00f367e836886b5a167635a6398bf820446d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used for SEO poisoning or distributing malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns, likely initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca71ed1ba---66028131808.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1rejq27tj00n35gap3a3jocdrd/9618873131.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce660896c---64182531409.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/63843662725.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/74489806811.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/54283742657.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/81338365201.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442f283b18---62448852184.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e6d57d08---53398929603.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/84278015526.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e7f4ac931---50572153919.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/tapezosomajuroxunezutuf.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/nigoludajifutetalar.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/segavabuforazoraj.pdfIn PDF document text
    • https://kawanmto.com/contents//files/famunij.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/62320522201.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/430949e441d76aecf0e406b908464bee/pasuwolelawumawedij.pdfIn PDF document text
    • http://mextro.de/upload/files/86033797078.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/25640373155.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/furevijunubaxu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e15064dd0ba1a76f555fde1c7d466de5/batosigakiwi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e78ce8e5b---musulokit.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fe7c4a64---jexitulajamodogatod.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/femevomojezunimoro.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/1411395333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=daihatsu+charade+2020+service+manual+freePDF 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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 11032 bytes
SHA-256: d37dc8083ec8eeb773730549378cffaa6ee7c721be6d1d86805fdd413b60a2e2
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 17288 bytes
SHA-256: f34eb1267806e66e9a5db32a03bcc07a68ccf20e630f7cf2293cf056b6400ba5
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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