Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ee116a76934abc…

MALICIOUS

PDF

86.5 KB Created: 2021-07-20 05:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0529ec2053bd986dd6f10236d59fb2d0 SHA-1: 2e84ca768d18286e3971ea39113361b800c393ea SHA-256: f8ee116a76934abcfc7ba3def026281ddc0cfb5982aff8c2678c2045d4110fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF link farm heuristics confirms the document's primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://promise-land.com/upload/file/xovubunawugega.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/fitesoxedavutigusalipife.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/328793a324a603cb2325d0dbdc547af1/fijoj.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd74e372fd---44354399313.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/89406188883.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fozupixejewixaras.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ee6efc85---21843971483.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/42606976412.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/uj35mcma8g5gd378heiqbvkei1/fuxakapusoranunudeweki.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/941a8e9b14ba30a7314e40bae0103c0e/ruxavurozuluk.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/39187992317.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210629_AD37E04461C6057D.pdfIn PDF document text
    • http://krzeptowski.pl/file/56242943338.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16243642656674.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_151056.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/tezivulo.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/44k7abanokv6st8qc8erhimmm7/31802523746.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c335d5dfb---1445142098.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/teterigukizotigebu.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/85571319141.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c088683dd5---gubajoxase.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8bde6df0bdaedcd3890cfff2658ca5dc/2482302810.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sajeda.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/kujuvejomuruwopip.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gupejifugokulavirev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kyle+reese+1984PDF 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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10136 bytes
SHA-256: 30a6a3646c042fd10857ecaa7134947826f5d34975861d2ffe05c8663977301e
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 16892 bytes
SHA-256: b1d0c87870e1034294be9a152fd17a09244cd40721dad8c085f6a0792ea68a40

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