Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69b3a82cfa2bd9e…

MALICIOUS

PDF

81.6 KB Created: 2021-07-04 12:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6904fe63dd47b57a8e717460b7e982e SHA-1: a51969f449c0f04de91a8d6ce5fe2f26612cd989 SHA-256: f69b3a82cfa2bd9e5630a11cec9c37d01bd65fc8dbdb5b155999b34f7cdc1929
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://quatanggiabao.com/images/uploads/files/54222606105.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/7879a4f2b76bfcef237e704720ccad95/lutimemilegaxakixipav.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4de43f0b---sewos.pdf
    • http://adamlegal.com/userfiles/file/tumilitemelow.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16093451b1fb5b---93411771662.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160902a75309f1---89546793656.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b1b5318131d0b0ea77060ff85b7c3cbd/fololegebasadazuxav.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca161abaef---18065415063.pdf
    • http://eksan-ltd.com/userfiles/file/82408703227.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5430a79650ab6d9a8d80ae45feea0bfb/fonuvidolugo.pdf
    • https://aduanaldelvalle.com/userfiles/file/tarizonevedawavurisik.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/41988523683.pdf
    • http://gemculture.com/userfiles/file/wotutijifuzosi.pdf
    • https://saunadlaciebie.pl/userfiles/file/vekapiburejisebu.pdf
    • http://pune-india.info/userfiles/file/dopurumaburubujuwu.pdf
    • http://hzjksj.com/images/upload/File/jixat.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6188f451---7616642585.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64054d5778---35970051190.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072161114635---bipidutejikamezudutaridit.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d99774da11---bined.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746172e5022---64458911029.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/53a478d5eb0a750460701bc930b265da/wisasaso.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e21254bae---39083790696.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pgt+computer+science+books+arihant+pdf+free+download
    • http://e1pl2.nazwa.pl/busy/fotki/file/93046961194.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d881.bin
f85f105e3ab4f0b715a56cf67b93dff6eb4a939ba7fc17db31e373023ade3f41
pdf-font-stream PDF embedded font (sfnt) at offset 0xD881 17276 bytes
font_01_sfnt_off000105fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16792 bytes
font_02_sfnt_off00011e14.bin
2b54b1427b26280907244a6424648f590f041f5a3680c989f4a0ffb531c213dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 11484 bytes