Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d44c527e1b4b446…

MALICIOUS

PDF

131.9 KB Created: 2021-07-14 08:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ab6a08f193354ae93d2748316a1c61d9 SHA-1: 93d4668e37b0afaf5a1f184181407103e151afd6 SHA-256: 4d44c527e1b4b446fcac5ccc334b6297e95e32497c6a89d8f7d7c79ba3a48c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or lead to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links on compromised infrastructure is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41deea18f---80167946634.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c834371181c934217b2fef39dc4d55fe/5110922768.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22bbf8f794---magovurujurepel.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/susogab.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kcktuag74q1c09cem1q4aqsmj7/gixuzivuwop.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k5a9khocqf375odna6qbl4qgc3/42664159704.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a681c416a22749ef25490e441ebed976/46694589595.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/81035232059.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e129c37f0b---zasofulenakeluxakoga.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb3d85408---nizenedaw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/300ebe090e686e6cd956e099bc0a0928/xesizotivuxoganixabusu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kamifes.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l1s2bgrbvv37j8mo0lmhd2gc82/senanumukev.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86cd42bc2e---woridemomisuwokugamamasa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3216ca60c0---jeruxisi.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/mezapogiberilelimuto.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/94331829814.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/82122526984.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/08d44af7e3312655a13c3d17b30d58a5/zuwegunisatedete.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6uufjek4o051mnu698vmp9904m/tejuve.pdfIn PDF document text
    • http://elm3rad.com/file/68149127457.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/91221732593.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae2bc4359---guromarinoduxozuvuna.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eda9c151ed4---61565484614.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/26538327027.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7b2d1291a388c51cf2869177a5cab5b7/joxesoboduwafiroside.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=3ds+max+2016+free+download+full+version+64+bit+with+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000169b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x169B5 27352 bytes
SHA-256: a1f768155709978badca9fdf1ffe5b0461ca176edc342d6a929b80d08b30e0f1
font_01_sfnt_off00019a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A47 17944 bytes
SHA-256: 36fb7a85040a0d3ad86c2e29d2deb2e720c286133e06d6fb885ef0e895f5a4e3
font_02_sfnt_off0001ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E223 11944 bytes
SHA-256: 8534c0f6b97719f76450eb98f4e3d7edaac4679c04003354261978bc1967a690

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