Malicious PDF — malware analysis report

Static analysis result for SHA-256 571c545d88ecf123…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 12:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dc0a3769d5368d9a2a9253a1bb03e03a SHA-1: 67546b72076bbe7faf5badb443b8e862ddfa8f90 SHA-256: 571c545d88ecf12373d3557020880eccef24920c61a9a3dbaed929d2e57a4eda
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alatheir.com/atheirwsfiles/file/supumoduragube.pdf In PDF document text
    • http://sity-luxe.ru/userfiles/file/josudumuxidufosuregolij.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7ad02ce09f6b280650dbd1105c3e91ef/megebumunel.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5nkdusiir1rspauemujb912qas/98937793091.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/e4bb1b9b996894d2ae567b516b3bfab0/pepibarudebupi.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/33784343228.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1bdf1e1f20f4537ef58fc3596926dac2/dinudegulijiloduwuk.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/4ed1ac3de0789d747718683157415d43/54924231424.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ee2e2557---2320045041.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/xerugezusibideru.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/576fadc9800c4b5d2daea47fede14888/80264929507.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/56172515980.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/9579612660.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3d571c0d---bofuzebiloxifopatidosapi.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/wetuxawupeluze.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/tobejosot.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/29335557069.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/427a27c4bfee8911fbc7437a78b29767/nozuvokinizijoviwu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff38813beb---naxibabefutujabamowu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c75392b33---kekenere.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d6ea0e468fda2d49217993dc3279737/biluxuka.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/98996133373.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4da8beff4d27e2c4fa7f0d9106f4023a/61869110525.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vexidemekiwawos.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fd35beda178aa1b5179348d1afe9f2af/dolinatiwewusinavavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+big+brother+10+online+freePDF 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_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 10756 bytes
SHA-256: 1891650068f2a53d6f9a1bf7953734993f5fe22891170314a4028572ec6a984a
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 17964 bytes
SHA-256: fd393ad1542af9c504db5a8ccfd839942c5f730acc625745dbb1b95623f22e01

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