Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95f3c753856b60a…

MALICIOUS

PDF

93.8 KB Created: 2021-08-23 14:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6632dba2ec5173af2f8f2e42e1570200 SHA-1: 50d3b72b2b76fac3a224b8439e77d0778c4275f5 SHA-256: f95f3c753856b60a882f9b94c4176d35dd789617de3e5e5fe0929d5671489aee
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The 'Remote-support tool lure' heuristic indicates the document's content likely instructs the user to install or connect with a remote support tool. While no scripts were explicitly extracted, the presence of numerous links to potentially compromised or disposable hosting sites suggests a phishing or credential harvesting attempt, possibly leading to the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://sanmorales.es/userfiles/files/98542706605.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bf66fd08---bekip.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/foribazezatukodoxabowo.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/4142445806.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/jisoko.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68102205373.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/3956777555.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/45582450682.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/lafumosunizuxawa.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34f3053db---71000000880.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/dojerowodoke.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/virubazomojegeginu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/s573gtcm10i8181ob502su8h2j/23374609520.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e86d68f3---39663927297.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e739fc2d709---terobalo.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/94380942333.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_080624_142.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/fajikikosajazatufemaj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7d8cecc334e5385a4e4208815f7b6470/tonezafuzofozesejef.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1bb004032acb1f91af25c402688c7851/putawegovaru.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/33273360678.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27a8bd8f4b---83414994254.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/4e3f14894dfc9abdb36f693b606414a1/safafibamixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nux+from+mad+maxPDF 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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 23700 bytes
SHA-256: fdfd50a374b9db7f766f8e5795a8439ab6a83315a6a5df558ae483e2d7ae2f8a
font_02_sfnt_off0001522d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522D 10052 bytes
SHA-256: 947c5d72af7229d090d3604b09176c74aa28bc38715e76d16694bf375113cf98

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