Malicious PDF — malware analysis report

Static analysis result for SHA-256 43354bc6ba0519e3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 08:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10b35239cb0cd76339449216c83f07d0 SHA-1: d6efc66b98bd220cd3b281619b8eebb43b4a955f SHA-256: 43354bc6ba0519e3dbf98bc940eb0df0ecb71887ddca61d2d2ba8b150b9be811
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.saaegfpolis.org.br/ckfinder/userfiles/files/13340718169.pdf In PDF document text
    • http://homeopathyhongkong.org/files/dufepemubiruvidu.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/59093815975.pdfIn PDF document text
    • http://m2m2design.com/userfiles/32658970401.pdfIn PDF document text
    • http://ligneus.hu/upload/file/80614021891.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/62742597365.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a0843d85bc7348ff960eed1c3f7310b9/tifobeto.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/577362795cafae5c07d6bb65850b9924/24789011539.pdfIn PDF document text
    • http://surtek.biz/image/files/20150128_094007.pdfIn PDF document text
    • http://sivam.pl/files/file/5314653910.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1629703386.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/49038255833.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0848a27f4c81bc18daa5daf6db2b063d/zikasovakos.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/geredepatexifelotudive.pdfIn PDF document text
    • http://metallpress.info/files/wopaz.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/78507e63ba3e0fb40b9ba988c4dd2792/tofugibog.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d168b4856e2726d16faf74598086d567/2749811804.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/8625vmoank34g1apcpic7bta75/22588002656.pdfIn PDF document text
    • http://coumert.com/images/file/93465974532.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8c99060a33398d7062edf224e85bb092/72074546945.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/funokunodajosexiwo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ec1a86e01b924df66d781c17afa9a515/34346657214.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/61761119304.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/6702683846.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/da9bbb1e24f17b9a75d13dd5356128bd/womalajuvuzibenozizol.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/83521185709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=electrolux+induction+cooker+service+manualPDF 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_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 17244 bytes
SHA-256: d3efff1405413ef4333a6ffb3b95d5f80f2493babff20ac9d047baa5fe72d96d
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 10872 bytes
SHA-256: 72f5c8232399d04907a62984913955e45b717d463f0adb149dee748cc678d843