Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5df7c5087eb1892…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 21:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d3903dbe699e11c1a2fe09d97785360 SHA-1: 6a2c227fcc116c85844b88d4f61b2014d5d384a0 SHA-256: b5df7c5087eb18928973fc4a3ca0d9f89e44e490b09fea76dfc510ba9a6f6107
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8100

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.
  • 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
  • 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://philabc.ru/uplcv?utm_term=fluke+289+multimeter+manual PDF link annotation
    • http://polenes.cl/userfiles/file/dogewefogifalutepovat.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/3744674010.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/86128112546.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tabew.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/sezakujopu.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210701190521.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/gapinekunupojofonalaxiju.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/zuvileneligawotazadel.pdfIn PDF document text
    • https://aedwea.com/upload/foto/soburutifadif.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/jijat.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/vonazilalesafakupo.pdfIn PDF document text
    • https://cncunse.com/d/files/64140513352.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/77839733029.pdfIn PDF document text
    • https://masihpt2.com/contents//files/98912087074.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/74ee7722f99b164314aa1d6dad872749/19365265779.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/78621317470.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/t0mc6badb922rv1r4ekguv6ht4/nufijipeliruv.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/78997774784.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2585f3be610139b54b848831b77a8ed1/28981504071.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/65388104073.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cccc66b94---28804539563.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/zijajinedajasudepex.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/72546413478.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/25077783807.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bc49da6aa538ac69a24293bb54442ff3/zapekorekakejalinimasafi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5e51f405---legixulukeludosovupesajod.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 20300 bytes
SHA-256: 58f77a2d880783c52e898f9b3d08eecb76958029fcd1d402e92323b24c7636f9
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off00011e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2C 10648 bytes
SHA-256: 5dd96ff5ad9a4adf638c3372cbbe6a0f6e0b45258846884053072aff1b554a86