Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0199bb0dd178c18…

MALICIOUS

PDF

98.9 KB Created: 2021-07-25 03:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 66919f22c49e866ecd762a7b63cccb25 SHA-1: 4f743bb5580cb567bc51ce022c3febbd2debb66d SHA-256: a0199bb0dd178c18c9534b016bffac508fa2dfe7fdae11ca8d10b01b388e8041
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the sample being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://morebricks.com/ckfinder/userfiles/files/85990033277.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dc2831a68d390200898a4abae1a0edde/debowegavabokogujesoro.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0afe6d529---50901846986.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qd4m61h7dhn26j632qk153su30/mazepuziwololazut.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/dilizuz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdd69527e---kugadebixivuvuxumejodegi.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/fca77d9d4e0dd61b262f06253c606492/79802496096.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/31890606161.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/lebotubozaba.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/99125813330.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/4frcgu53hemcbc0ilq7afoshcj/jiwelegat.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/didosigijijetasajofup.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7acc65544---19262020422.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/62511752479.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a451e668f---17614070663.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/neditudamu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6cbf82c91---94584136816.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/5345087075.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/73729767010.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb220d5fc32---77332232415.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pazitisibusizazovotevok.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/94908454837.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/suxabelulesib.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/26004895229.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/82026501340.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0cg6amga7fl1pqa3tl8lttdvhl/lunoguzudimunanaxegudagil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=face+recognition+based+attendance+system+using+python+pptPDF 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_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 18116 bytes
SHA-256: 64532c269447664405ce8226aa02981d24a0735b2a784eeeeb79c396ad2e5bdd
font_02_sfnt_off00016357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16357 11248 bytes
SHA-256: 86c48e85b7808161847f60c4d64ade48e0879a16be24f62444ed850fb7501cce