Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afeadbb2fa4ce97…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 21:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c2d55fac295169ac7b858d4390142a4 SHA-1: b3c9bb065c48efedd6ddf420dd2efffa61a49582 SHA-256: 3afeadbb2fa4ce97d69ed30671d1c52554f100f81d7e6590aa0b89946d20a10b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/bee34519f0f99d170046bfe8df47237b/72610439604.pdf In PDF document text
    • https://cengilli.com/icerik_images/file/letilitijot.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/70619622025.pdfIn PDF document text
    • http://mextro.de/upload/files/wokobuxumizo.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/29273134432.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pthhdpq8eqm6hfvnl6tpiivefq/javodiveporusotesoge.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/85207269826.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/62742460524.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fbceumm0lfdeb9gjdcvm900oqt/86579076177.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d81ba4774---suvekix.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/17155764118.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/sakejizi.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/lugip.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073495f9ab55---pakigepanitiwaful.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/zobisa.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/89741287619.pdfIn PDF document text
    • https://invest.pl/userfiles/file/pepuwomol.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef9a7471d---lojage.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/89884528873.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c8e545ff---55276811132.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/veliluxijosupakarat.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/45801972482.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/sesugoj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6d4487e2---57503203416.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/o1s0e3uov2a8cjq5g3nau5frp5/bosufazegerotuwipij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=systematic+layout+planning+muther+pdfPDF 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_off0000bf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF98 11356 bytes
SHA-256: c7b5e703f44a3aeb05aa704cb126e11eb7c060cc2d2f897b4826ca7294d33451
font_01_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16896 bytes
SHA-256: f2ad55e820ffef9a395b36af4423c8ba77d97c0ef340b964ebc5b4bec7d2281a
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1