Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc5a4694d0f8075…

MALICIOUS

PDF

94.8 KB Created: 2021-07-29 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b60662ad5647255707e52c00018161e SHA-1: 73cdfc2c2fbad07b55549abc75386acba8491092 SHA-256: 0bc5a4694d0f807512e377035e99a993151dbc22005c16a96ab255d07570b458
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://magicdiscoradio.hu/userfiles/file/69503443516.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75410c6e30---51026854508.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/menawoz.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/bizazi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d25de32a5ab---pokisanuxi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070abfc982e8---97960907733.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/74374605538.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/49150434862.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b790b340976---desisekubuxofon.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/73378139606.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/rorigowopelemakalu.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/rosalapebeduxizelapozap.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7bb332219---15639047895.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/mogakupegapolulo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/27673852887.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078706ce1f04---46923928657.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/govedokusanariropino.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cd45c40a368e3e9dff247821a1238da/10883003479.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf061edfef---10895753556.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/36907518083.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f4028e78---45866921358.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/vesenukuruxedo.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/dopabisamumoj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf1b2c4421---93801636758.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a34face3f7c32e5bdf2731fa42391f60/jutusurumajifaga.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/71313943945.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l43kp83chd1gi6glu7mjo0rlu5/jisadivawenisajipa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dc7394501a58e4ee11e3eca900d75097/zizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+genetical+theory+of+natural+selection+summaryPDF 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_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 10960 bytes
SHA-256: cfae6af98c59d68119d959189dd863fe476afe361a177d3f0031660343fd122e
font_01_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 18344 bytes
SHA-256: 30f1a56cf497dd7a3133eaa287426a2f6daac8d092bf76273f7e394691906e11