Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a09cf2c90dbfaa4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 01:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0975aa7ca60956c993d8bc544f044401 SHA-1: 98eb0cd4ae6511be4fd480207771f6164e63f42d SHA-256: 1a09cf2c90dbfaa4e34ba85c28d5043a822baae364afa466b2230b7f661664ae
164 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing or trojan payload. Numerous embedded URLs, many hosted on compromised CMS platforms, suggest a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://comptables-publics.fr/userfiles/file/gibipikudumerijuvow.pdf In PDF document text
    • http://bpabv.nl/uploadfiles/file/zolipobefix.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/tatijidubugimixum.pdfIn PDF document text
    • http://lblussana.it/images/file/10121065510.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/toxemuloxobinekewu.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210914013038_1213623310.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/71185817567.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/7bvqn8brq3m125tol7mhkq3v7q/wididumup.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/gamavur.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/liwulaleziwefadig.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/fisotomili.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/zamatakikejelirojak.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xutadolizeworetewus.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/35752638366.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c59e1d2a---taxazisajuxapepezu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/e8cbi6209j976ngtslogkl1se4/jusetijezenu.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/pasewusilabajemikijomezu.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/lepenibejaroxirudem.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/tusuxaxaxud.pdfIn PDF document text
    • https://ms2oke.com/contents/files/jakarelalolegotugosakovig.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wemubirala.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614212861083c---soxufipijogowatazaxurokew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wcc2+mod+apk+free+downloadPDF 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_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 19024 bytes
SHA-256: 7423427dcd2ee1e43932a8134ac4debba3f577034db9b5bc009d24a9262d69c3
font_01_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 10712 bytes
SHA-256: 999ec959068c07e08c2d654d5d6a31895e111a31e1c86cbba6d184afc4919a03
font_02_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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