Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cda57e56589f04…

MALICIOUS

PDF

100.0 KB Created: 2021-06-29 01:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a1e9fad03e54bd7a18a4af718b0de932 SHA-1: 4099d312e29236fb5371d327f3f5747b419cb7ad SHA-256: 19cda57e56589f04171e4fe69e02ef71f974ff0a7dbf5776bebfce34b2e2a255
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely designed to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0f586bdd---87925170073.pdf In PDF document text
    • http://hrdiborice.cz/erucom1/files/files/zixiv.pdfIn PDF document text
    • http://skupka23.ru/upload/m/mobemekikanikaf.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/butugopoxilikurewopaziv.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/56193142812.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607372e0902ea---23625254820.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/96206859471.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc1151009---pexebobuweki.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/6e1d4100f73e63e1755f2f7b4c1ef137/54410093311.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b1c10cb1b---40494201349.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/rijerijipilojibid.pdfIn PDF document text
    • https://haidangpc.com/contents/files/kotabifigazog.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0175ae01a0---serajeno.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e7a7bf80aa3c1585ab45ce903ef215bf/buveda.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/10bd94df3c3ced4e3501bd74d653acd9/xufelifonetegapanatewules.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5a381a4e5a30ce46ef7dc62ad86ba05e/wamufevipetijiguxo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075cce1c23ad---8744186104.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dfce8204a---32760913982.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/kk69vga85qp366gv62rjfsspe1/zaxugatosafi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c754c69bda---toxofugugukejij.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bb35a9095a3758923e4db5d815f44b39/62176893426.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e214a0777---58147027622.pdfIn PDF document text
    • https://ienter.bg/files/jowozuwiwirofezajam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ncf+2005+aims+of+educationPDF 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_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC3 17204 bytes
SHA-256: a0014769602d3545bd91e30bfce206b2147f1585951fee09341586b3114608e6
font_02_sfnt_off0001696f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1696F 10944 bytes
SHA-256: e030b1ac303caf9d6fd99271aebf85a48f5aa4e969fd505092fad44f6f794a99

Open this report in the interactive analyzer, or submit your own file for analysis.