Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a39a314f50a35d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 18:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f68be24883574bee2d228eab7515ca50 SHA-1: c2300d27f18f2b0ab0b02301dc5addac74bf5891 SHA-256: 45a39a314f50a35d1051ed1717442d3c5ca9855075be3340e4f5f9d968239496
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. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or unwanted content. The presence of a 'happymod app download' UTM term in one URL suggests a lure for application downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0f7512bec7148c2e871e00e20cf7304d/8925803782.pdf In PDF document text
    • http://asu78.ru/userfiles/file/latapax.pdfIn PDF document text
    • https://promise-land.com/upload/file/fotilijowikumopufefo.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/luwijedavuxa.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/waxomixeji.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/76844293675.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/80745074795.pdfIn PDF document text
    • http://enricobarraco.com/files/mekuluvesasabo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141513a5e907---85117005417.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16142822f6cbe6---wadowemoju.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/gefar.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/17958980872.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/bediwaxebumo.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/wemovupozafifaxuteriguper.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/gipuz.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zatezeguge.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/64795769763.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/jubidanev.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143eecdd446b---lodokijamamonituwuxi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdff0e14ca---34917085195.pdfIn PDF document text
    • http://df-2.de/images/daten/file/2183231094.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/72915111063.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xeresekobodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=happymod+app+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 21432 bytes
SHA-256: 49ebf7d60543f7113b57aece16d536f97b0e2740a92ed7268cb3a884d1b79adf
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10156 bytes
SHA-256: 261773f7a3fd9f95cf5ba8e230b080d6ca106978150a21ecc71a32062ecb53ac
font_02_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 1820 bytes
SHA-256: 951e131415af13d1494f939c8c98b54e8d79abb67b553c70ea3a087436d53abf
font_03_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1