Malicious PDF — malware analysis report

Static analysis result for SHA-256 a750c896becf3120…

MALICIOUS

PDF

119.3 KB Created: 2021-09-06 01:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14ddcd3437df2f41e343ea9c7bd95c98 SHA-1: 3dafaca6bb87d41d82f1212e73c0670872757dad SHA-256: a750c896becf3120c1996ff3417e9b40154f8887fc5aed681c017747a780db95
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, including one pointing to an IP address, suggesting it functions as a lure to a compromised website. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports that the PDF is part of a link farm hosted on compromised CMS platforms, likely to distribute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • 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://185.33.116.145/~acus01/upload/files/91867766909.pdf PDF link annotation
    • http://senvietsystem.com/ckeditor/upload/files/51393196939.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/9196951801.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c2b13f8d2b08b8e44491f25530a8b265/zipotot.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c556911a791---bateluvonidasuzatowaxavos.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/2871267667.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/16dc052ca0f6ec9f9675b2f82d281436/4610788790.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa3d94d1e---boramekidulunomobat.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ajbdk8022i4aqnu29fca60eed3/3350078893.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/5216812790.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/duxomivubi.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/49319450217.pdfIn PDF document text
    • http://qzgj.cn/upload/file/62312606807.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/09smb4246jh3c1go0pbon6c485/93227774762.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f53cf06dff0d904d05b5ad6be9aea54/98156580118.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/bubakan.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/20380282984.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/pigalobujijewerimezalarew.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/56412691113.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dd50f66dacddbf49ad8cbb59618e8ea5/50818028420.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vj9khkd23irqn44q61bcehqubh/worewemimifenavofake.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c59fe01d7---naniwetakizigoj.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/komawuvonafojoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=udid+format+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B78 10216 bytes
SHA-256: 03eebbc98040b7010fadbb4a1cc303a66a840424dff8de78f65a57882d81facc
font_01_sfnt_off00018253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A65 20076 bytes
SHA-256: 9f7761057205dabb0624c94ccdc1fa95c8aa16188eaebd98379f6a5b9bec9ae0

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