Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e9bcd07934dc36…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 19:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c40f78b04282cc2fea174f81fa588f1a SHA-1: d1db9b737762c717dd6f422ad56d7e8eab55cb19 SHA-256: 72e9bcd07934dc3679a89e773fee460f84bdc9d438c8fc04bb8ee7e6a8658a28
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of multiple external URIs and link farm indicators points towards a tactic of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coiffurenais.com/userfiles/file/38290069510.pdf In PDF document text
    • http://share-world.tw/userfiles/file/lorutasakanetufi.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/79470405854.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/raxapikinalu.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/65231871591.pdfIn PDF document text
    • https://comfort8889.com/upload/files/kisurapokazesikixube.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/dogixamebowabetitebopakuk.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109171151527346.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/65590742053.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/widadalikawi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/p3l8877cr322ogg895p1dlsnt0/45937448540.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/ziwotapazonudefipurozaj.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/woxifukaxanip.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/6362416574.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210917/file/16318755773314.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/dizazapepuzazoxivik.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161394fe7b1661---daxanukupi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/dejulizilefemusewofixilub.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/pebaposisijam.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1ec93fe9---juwotonamaxujawu.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/kuxisagikusabur.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/12474557741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+virtual+machine+for+windowsPDF 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_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10976 bytes
SHA-256: 3caf5c54a2e775b93f3a90d0cdfd46281ec5ff9653d747c9f78d0153a713fab1
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 17528 bytes
SHA-256: 2a2d0400b91558899e2500e8431ac33f28f7b74a8cee6575383b8f776ffb0ac7