Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70e87fefe4b88b3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df3239feaac318eb3d523101b5036546 SHA-1: e2c52625633f62947126928b029dad9aa2e1dbd6 SHA-256: f70e87fefe4b88b302b743cedd05ed414f21d13f5ccf8f6a5d558445a46ed62d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Heuristics indicate it functions as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/74785849402.pdf In PDF document text
    • http://say-international.eu/userfiles/file/sasijeri.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/boburojotevosofabobanoku.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/33135354121.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/zosisodolaju.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/32192161457.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f26e0013a032dc097e85149aa0d9f9e/61664337192.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c05bd981---29421666309.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/14480014724.pdfIn PDF document text
    • http://etkenkalip.com/files/wedib.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92809609268.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fepaxixumazirevokewipoju.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/12778938666.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/viborejumekufumabuz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356e175dbe4---rodepepulitovokadatag.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30378358711.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/85198990227.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/77570606510.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/vagufoxinumi.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dunokabufe.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/59265740795.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/23520542068.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/furagabuba.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/15011763593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gaming+live+wallpaper+windows+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 18224 bytes
SHA-256: 8a2257dbc32ced16d4064cc804676db6b47987365a2ace6e47b816870e99580b
font_01_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 11000 bytes
SHA-256: 8f38f3e474ee0f9baeda5986855a06ba59aa123beee738812bc0e6946dbc18bb
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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