Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5488ba6ecbb904…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 10:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5081cf91fa8604ef5350a2c709ad74ba SHA-1: 0ae4442e38c9925a1157ac842e90e17e068e1197 SHA-256: 3e5488ba6ecbb9048f39b80f2af89a2f0bec74f81c03bf03670f07afbee78747
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://flomojapan.com/upload/files/98396769246.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/blknifnr2bbcvoof691o7r08ut/21947444655.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/sajavezebapela.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a9c8a2f7b70eb8e17a1d403b685a6d0/99119442153.pdf
    • http://buren-kompanie.de/userfiles/files/fekujofapuke.pdf
    • https://waroproject.com/file/63372163720.pdf
    • http://tcihk.com/userfiles/87719691812.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/tenepisabewugokumabekiv.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6a2db63dfd967dcb50a68299af8a8918/wizog.pdf
    • https://cochleartudaskozpont.hufiles/xabivexokefutoje.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/numfn90q30obvksuuqqodmds1p/bubadefenarutaw.pdf
    • http://sskj.pl/userfiles/file/lodejelulelejadifigap.pdf
    • http://spreewaldatelier.de/img/editor/file/91221732593.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/81162775799.pdf
    • https://uudanbury.life/files/file/45702394746.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608059e537842---98333598630.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade390e6818---24615240941.pdf
    • http://anipetkingdom.com/webroot/img/files/9410630177.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/3108711396.pdf
    • http://busankid.com/webfiles/board/file///39017275723.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2af69a2d1064e41909d06994ea1e1831/mosuk.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a65df50751---36261471620.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/33240626426.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cdda6763af1b0be786d9f6134854ca3f/kisipofaxamopud.pdf
    • https://aashianarealty.com/file/texupuwune.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-6-26/20210626090019591642.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dua+to+protect+from+dajjal
    • 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_off0000db00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 16792 bytes
font_01_sfnt_off0000f312.bin
b6e30463de7e99b95f27c227f50d20da09dbb1059d7592a3d8ff5fe19b48a8ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 20820 bytes
font_02_sfnt_off000129f4.bin
c17820df439b3b806a5c0c9348f98dddeb0c15606df7d7cfa25b4daaa7535179
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 10648 bytes