Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a36696bf9c108f…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 23:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0be1eb3874aec7d3d90b45b7500caac5 SHA-1: de6b937ea7b038cd0e55de42296f0aa44cb90bdb SHA-256: 22a36696bf9c108fa87f99964ba8bdf747e42c240f8d8fd400fe0bfd00e4d212
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://goldnumber.info/userfiles/file/96375390807.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b87847be234---pijep.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42d0ac9219---88288946832.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446bb8585d---vopawazamuwijajivokubigo.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/25448020663.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4bff63b5e7f74033f4a93a330a5d064a/medopegewawofadonamo.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/41720916933.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb45319e4---pofusupekivukeze.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/41682987060a242c63c707.pdf
    • http://palyavalaszto.hu/teszt/upload/file/98574195164.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dcea15d880a193955ca325ef586aaa8b/surizaniradi.pdf
    • http://gd-weimi.com/upfolder/e/files/20210625074924.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9b8946712739dfc2d08c370dfd6a6342/vakilekujozaxixubixifo.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/02o35o914n6lspr21qrtpttd99/18284182101.pdf
    • http://trendymamy.pl/userfiles/file/dejijisuriwifo.pdf
    • https://aterhesseg.com/up_image/file/45308551498.pdf
    • http://sity-luxe.ru/userfiles/file/49772490879.pdf
    • https://turbooto.vn/upload/files/zetobusofuxomufu.pdf
    • https://299-45.com/CKEdit/upload/files/lifasisujivewo.pdf
    • http://nktrading.qa/file/files/2757733491.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada99509e9---vanenujomom.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vb77bb1coqg5a2h4ql84d2gd8k/zezewikededozekolitapipen.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607022012b3d2---63442026533.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/sjb4dfrfhr68j4cl0ih38cnrl7/54414582402.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+a+herniated+disc+feel+like+in+middle+back
    • 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_off0000efda.bin
9b0dac06e66bd22f8dfb9bfceea607c84851575210a69f960eb5506a7a3efdd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16536 bytes
font_01_sfnt_off00011a89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
font_02_sfnt_off000132a0.bin
527ffe1bb33ce5adbdebacaeb39bc251145e66812cbb57535b77c3b9d252c060
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 10964 bytes