Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5eaf77e42e5c99…

MALICIOUS

PDF

87.6 KB Created: 2021-08-12 12:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0230b4bb18285da87e75b3623bdac58 SHA-1: d9b065e3d21872c17f76510c6d40502d39d609ac SHA-256: 0b5eaf77e42e5c999a8cda58c5fb93c69022b8ac6381ff42b278c2e831dbcb61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, while numerous, do not contain executable content themselves but serve as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b127b6228cf550372eb6f26495618226/95153048684.pdf In PDF document text
    • http://barrospizzadb.com/uploads/files/70592739261.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9939b3231---62649149804.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/79d7812e1aa7961a53dc9d7ae5b01023/kukabojalawirobufuzagi.pdfIn PDF document text
    • http://maihome.hu/admin1/file/xigije.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5486239faa---43005492322.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082e44120d47---43747284933.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160824986c428d---sematego.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/10241116975.pdfIn PDF document text
    • http://edallyshop.com/upload/files/vekarovor.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/59910606878.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/solojakekevezarugekok.pdfIn PDF document text
    • https://kopari.hu/files/file/50697878723.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1b6310677a63f0cf2aa11415c7644540/47941206908.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/nemopir.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608df699749b8---25473953602.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f4d893e4---tokidetoxam.pdfIn PDF document text
    • https://senfina.top/uploads/files/30220310722.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jaiv7e7vjd81pf06el0p37fgkc/xubisixugis.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/44775317109.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/rivuzefevufezega.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/r0cv60stihsokqegs621olr1ph/84962760539.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c9a5d241a---bulejitalabebako.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/979c70424f18fb9b2dede3023ac6558b/kodusa.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/wasolufowad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=old+testament+time+spanPDF 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_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 16716 bytes
SHA-256: 96ab4e3a27136e439546bd34b1ba2b5a636f7ce3fc37e835ed0b3635b5616283
font_01_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 10356 bytes
SHA-256: 215062bde754ebe7e3dbd31c36ff6444bba984ee45e062caa51faa5cff2a6233