Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b83f721114507a7…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 21:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a0f3d372693cd14b427634ae2dd2729 SHA-1: 9df33d5e1aef46ad77fdb87b428faf8b9842f9f5 SHA-256: 0b83f721114507a7ca0431251e15561fd4fa24c61d361a6bafeebfde57bcca13
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple domains, some of which are compromised WordPress sites, and others on disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download' button lure reinforces the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://police8coop.com/UserFiles/file/85435365452.pdf In PDF document text
    • http://tomekorea.com/userData/board/file/91990815888.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a85ca7c60030501612661842ac0570b5/vikozop.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/najawexaluve.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161369ddfd0623---zulawunedosotez.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/zowagipabimidapedananejo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/18c67baa0eecd7b41bd4afd604501e3f/femonotivobemanar.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/78127241220.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/joruzosetidalafuru.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/besugeloxowujivekodepi.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/dosezilisameve.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/52904864314.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e50506d0f---lukizema.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/pivapanexuri.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/99272730137.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/kigivelujilezaxujilutute.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zazevagepuzi.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/likakejafabarapezasu.pdfIn PDF document text
    • https://tempegaring.com/contents/files/tinusenolozopile.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210903102846.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/19187104010.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/62765904008.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/34490139278.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/siwesoguges.pdfIn PDF document text
    • http://inistor.com/ufiles/files/67593372013.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tatuzaminu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+maps+mcpePDF 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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10468 bytes
SHA-256: c6af0857cfcd1121f40f554fda6a0a6e5948b24f929b892cdcf9283006ee32f0
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 18352 bytes
SHA-256: e26c7897f1d086b3ad45ef231734aeae990a4e62a8fc6b4cb9b4b3bd903c99da