Malicious PDF — malware analysis report

Static analysis result for SHA-256 0558a856086c024a…

MALICIOUS

PDF

77.3 KB Created: 2021-07-25 02:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a643119bb7559784cd0a3cdd4e92ff4d SHA-1: 8e529e6ae77d8fc928bc51df718ce832117bbb5c SHA-256: 0558a856086c024a20f3fa3716a3225f146382793c29fc227e0849421429fb17
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ehomeforeclosure.org/images/file/92464068800.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c66382217e4---kafavuzowuw.pdf
    • http://omg.su/upload/File/70492113180.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b2ee51d4---nadefimeganebanuxewob.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85f1002e9---ridifomuzifewubal.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1b1a660ecf9f7b867c302dfe830eed56/gesofal.pdf
    • http://myflora888.com/ck_files/files/12196622250.pdf
    • http://iglozawiercie.pl/zdjecia/file/zaboxexujelumu.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/l1k09houpdfona790mof1ot5o5/60045958427.pdf
    • https://festival.bg/fckeditorfiles/file/tulavawikorutuwop.pdf
    • http://hrudolf.com/userfiles/naxeseretezudafunizosasom.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f921c984a42---kewosiwusopitozovewo.pdf
    • https://alice-immo.com/userfiles/file/majal.pdf
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/30481244318.pdf
    • http://files.ibiza-ferien.de/file/kejofotewanikadumabuzig.pdf
    • https://ibericadearmerias.com/file/27822013265.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5572536d5ab029b7a6302e7e50516901/buzevuvemoregeliruximisu.pdf
    • http://gialtour.it/themes/userfiles//files/besuravoma.pdf
    • http://hnsunnyfood.com/d/files/jemupagotibevuminisoxu.pdf
    • https://afmiletisim.com/resimler/files/53945487995.pdf
    • https://arabacioyunlar.com/calisma2/files/uploads/lonexiw.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/1pl9ft04ve2k1vnpfle75iolkf/vesub.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160970c489055a---rupapuloxavujidaxevevowo.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0691b247ee---45388030753.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c57702d546c44fdea4a35b7dc249e784/84601216779.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=achyutam+keshavam+instrumental+ringtone+download+pagalworld
    • 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_off0000c7f7.bin
4b7e5813954c975b38316f83c7009611f62fa4cf2dc76e65b83fb6db8a86145f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 16728 bytes
font_01_sfnt_off0000f3cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 16792 bytes
font_02_sfnt_off00010be4.bin
65a52b8b70f773c4f4a521b59bfb4c6ffde8168d7f13ef02aaa57f31003886ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 11400 bytes