Malicious PDF — malware analysis report

Static analysis result for SHA-256 e365d275d1d15da4…

MALICIOUS

PDF

151.5 KB Created: 2021-07-01 14:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d76cf6b110526e1ca45d09d1a6ce5ac4 SHA-1: 22b324ddf80fda59e9233a24ce3d3780ffb072d7 SHA-256: e365d275d1d15da4c30914cf7fa6619a2f0d17de329eeda51aa4cc64489d1403
156 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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://garderoba.sk/images/_file/rumagefenapalaku.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5d8621729813eaee86f82ad38d748a3f/72799271394.pdf
    • https://rendiamovisibiliglinvisibili.org/file/6435350991.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66badc80a---nabojalamunojo.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9764b0c9c---xubem.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a427062e076---kiginomitokonu.pdf
    • http://alexlunacoach.com/img/editor/file/30455337273.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/29a95aff4c1b90da50024560ec7729df/83275950586.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pl62a831rn6fr1ub7qsb257om0/wisawifofokuxutaperufe.pdf
    • https://mides.vn/images/ckeditor/files/lupabuvubejalokena.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06df4e9691---juzitaramano.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/67367826729.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/410971c61790eef2cf2eb0af22c5a196/mavob.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c690f93b6f0---64834580540.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adad40495b8---xikodojupepitanowifepejan.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/jozunonobiwekegutepopap.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jarelixururasamozulebogut.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5afe22ab---40529808769.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/pixiteruwafotagusirux.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d0390ec7912768c4d74e05c1b666d90b/wikiga.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f038cb4d---38643088207.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83c31e737---vemananajaxarogoleji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+conceptual+and+theoretical+framework
    • 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_off0001ef59.bin
decb059c04ab63bde6c8074aa98e396e4bd6a6ca60be54c9ddd7f656b759d4c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF59 17992 bytes
font_01_sfnt_off00021df4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21DF4 16792 bytes
font_02_sfnt_off0002360b.bin
5e41f00ed51d5130cb8781a8606ae9b3cdf1d5d9dd13d93a93e542517ca85acd
pdf-font-stream PDF embedded font (sfnt) at offset 0x2360B 11156 bytes