Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c42f291f5d2a71…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 18:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe0c4d989e6a15bc5ac1e8a39a276f1a SHA-1: 4d464b209d7a4e6e1d88cca2fab03f0bf3b97c0e SHA-256: 89c42f291f5d2a71931f2ba73ecc7b90ef2dae277f1d65af932744a3308c3ce8
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or raw IP addresses, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=consonant+blends+word+list+for+kindergarten PDF link annotation
    • http://gaudi.tw/upload/files/74654677694.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/194533981361335dad6e64f.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210907_042242.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c36acbbc33d19ea4a9c8f19c5d8b31d3/35262147559.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/33420559224.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/xazotezunobupe.pdfPDF link annotation
    • http://rainhouse.kr/data/editor/file/210590218061361c9cb5b66.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/tisajetotix.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sojim.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/jd9v72r3ejaoue4ivbm4hi9e6j/piluwajuxox.pdfIn PDF document text
    • http://pneusmarene.it/images/file/nepisinenaputusoxa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161372181d7333---gudexupenizilikad.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/masisusajemewurezag.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/jimufuvez.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/82822680314.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/80089256449.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/7319664274.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c7ee65d358f6fcab9be93b93bbd24ea3/wumixidojer.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/saduz.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/60772636363.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/43655109720.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/93469586096.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613045246e304---xefowetal.pdfIn PDF document text
    • 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_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 10880 bytes
SHA-256: c8a70309b4f4d3e553dc08f47d753aa22548fe6ee58f4e479f1e32b8d5913a18
font_01_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 16396 bytes
SHA-256: 9cb35f53013532c66a95efc106a41f65b302efaec7a206647d7ec3500a71cea1
font_02_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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