Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa3622e8b87336a…

MALICIOUS

PDF

94.5 KB Created: 2021-07-29 15:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e0f37c553615c7206db7c66caf0620a SHA-1: e13d28f511bdf79aa43e95251a461013718bdf9f SHA-256: bfa3622e8b87336a15824735cd37fe242ecb39c45d55c7eaff0e4c222df0aaef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of links to compromised WordPress sites suggests an attempt to leverage these for hosting or redirecting traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e3f8b39e910abb8e5d9a3e7ca381001/zaxokakidataro.pdf
    • http://debschoen.com/userfiles/file/79511694708.pdf
    • http://ankurgroups.com/userfiles/file/40464194626.pdf
    • http://viviapalermo.com/userfiles/files/46744512946.pdf
    • http://myphamhelios.vn/luutru/files/xiwomalikafe.pdf
    • http://bnblspecialities.com/userfiles/files/84894180761.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b28107071cb---todar.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/94193683deb7306d50327dd738fa16e4/sijubomofuzi.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69520e37c---zinuviwo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f3153794---gosidek.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ce0187b3b3d215146a2212b174a582ca/78771150627.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/betexilekisijuvuge.pdf
    • http://ballarioarchitetti.eu/userfiles/files/gafupulililozumaza.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/21543751871.pdf
    • http://93564497.com/userfiles/35373631831.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2604b3eac63dc651240a59c8a3608354/79004066303.pdf
    • http://a-pro-peau.fr/userfiles/file/liveziwi.pdf
    • https://hophamthaibinh.com/upload/files/figuserewozipidej.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/kuzenugixibajapo.pdf
    • http://888spirits.com/userfiles/file/lilolegukiwideb.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/6794accca7f70f1ea615f7ce77258284/divizetivobipuvosezufejiz.pdf
    • http://pappteam.hu/userfiles/file/87055775563.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/grjkn7u04d4kjo9lsu1npibau8/lalosamomukefoxewap.pdf
    • https://www.alapan.org/fckimages/file/sesaxemotuxazuxex.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/wodukofepapezenu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+someone+hack+your+cash+app+with+your+email+and+cashtag
    • 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_off00010aaf.bin
4e529b8b6377bae6618e916b84ef161fd710db08d1e851abf07d25444b254cf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 17396 bytes
font_01_sfnt_off0001385a.bin
75e2eb565487b9553a1c7948845e45eb73ebbe9843bacf180261bae65da16800
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385A 11384 bytes
font_02_sfnt_off000152da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152DA 16792 bytes