Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0977bac8af9edf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 14:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37a2ee50c096d498bc6fab01d7aff840 SHA-1: 38c4ccd877c2bf4c416e8683f57454798790967c SHA-256: 7f0977bac8af9edf28a7c3210aa48e0b3325039211eb7aa8f116b9bd0a78d8cc
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities to execute malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://oilmachineydy.com/d/files/vesugewilewodetuvuzew.pdf In PDF document text
    • http://rauvuonsach.com/images/uploads/files/wulidusiwifapuba.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/48248497405.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c5ef63238c---jigutimoteriritagos.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd01478f5cf---84052586830.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/58664628701.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210813212359.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde7c8b769---sewapomafiten.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/49778617045.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1cf9bf102056f132febdecd11d2017d4/jobilivakipo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/79371195661.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/xisatopugom.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/57184489855.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/efa3bb46261ba336559304f9065387aa/29525831555.pdfIn PDF document text
    • http://zerosquareonline.com/file/83669407250.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3dcc1f5d---wevoviverawiw.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/navede.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hfn30ohlojr6jlp83q92qgihsu/fasotafuviwafe.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/88819266223.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1d75vnaujiobh7oo1u9crm9ig0/vorefu.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/6956432568.pdfIn PDF document text
    • http://falerisztika.hu/tmp/36227809861.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff18bc964---xizekali.pdfIn PDF document text
    • https://autoskola-scp.com/files/30879587388.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/62a10b7ff285706ef7d740282db9d394/nejusexanibesaram.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mibaxibuzozobolesezepofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=multiplication+word+problems+4th+grade+worksheetPDF 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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 11448 bytes
SHA-256: 6f68e905b7ebea856a1d7161a7ad23c7ec051974560b4738c804d12d4cbabfde
font_01_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 16424 bytes
SHA-256: dda4807bd1fac305966d2362f4167a5be66430ab5d6ce6676e758ec2ed618d9b
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1