Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54c4adf87e9cce9…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 00:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bd5348c3b00360fefd5ba7889a49f7e SHA-1: 0902e3ec6767b4e64317be7cab6954188465fc4b SHA-256: d54c4adf87e9cce9a3cdda0a7adb60133de32b8e7618264d68e850262c44b8c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beerskiboot.com/img/upload/file/1026777607.pdf In PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/lakevupek.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/zilifepegu.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/duxod.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/figuxuzinikax.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/86391763628.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/15935808926.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/mesukibamigazilomar.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/34241585964.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbf6bb4b9---wunugufuzi.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/lenitidu.pdfIn PDF document text
    • http://philboyd.com/vebezonizawowiti.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/fopurigudunivu.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/zozubomutisokinenu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/posinowomubete.pdfIn PDF document text
    • https://angkagenap.com/contents/files/kuxovuromivur.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/16679ef480ccf17c083ec5f0939d8eb6/ritedunagopijifoluvovevu.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/9987868856.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/bonumumemupewewuripaza.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/83430491763.pdfIn PDF document text
    • https://ms2oke.com/contents/files/75326895732.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee57b4df8---5147163581.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/72663075425.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/wizajekonetaf.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/44839607490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=which+is+the+best+gta+game+for+androidPDF 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_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 11012 bytes
SHA-256: 975bfbcea95c3b0b4691c4381a1072170d5b215d8fb20e7bc01ef2ab3dc1225c
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 16752 bytes
SHA-256: 3161115016cccbd21a96b6b2cf927d1f1ad8814ad3310de161dac090cdb19837