Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbc1a643a96a9bc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d91674d10c3c223c1d56c411f45b2419 SHA-1: 5a1a3a4aceb052f747db62606927854b7f3d5ffd SHA-256: 1bbc1a643a96a9bc28d1774d028cf40ef9b6b3efb8bcd458cf317319f60e38be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://piataafacerilor.ro/app/webroot/files/userfiles/files/sapixaxetelazamurora.pdf In PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/vosob.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/9234838373.pdfIn PDF document text
    • http://debten.net/UserFiles/File/31456087740.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/37283364347.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/fojisajopadumuzokutiniri.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/sirovedaxebobiwitojofeli.pdfIn PDF document text
    • http://zamgph.com/uploads/file/030751518092.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/84790751629.pdfIn PDF document text
    • https://digireg.cz/upload/numekobiribararetatawizo.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/5007340323.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/51540964452.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/telifikijelesadafetaz.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/sivaboresonuzivin.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/ludiwef.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/35937082900.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca811ba55---minegonak.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/49331687147.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161386b788f483---lozosimokibubobikozotogak.pdfIn PDF document text
    • http://hanifeugur.com/image/files/talatawu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d59631c38---81189398017.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vomizaleresosivuwemuxojas.pdfIn PDF document text
    • http://erdenetpost.mn/userfiles/files/kugulagijuvigeritexelit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=show+me+temple+run+gamePDF 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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 17920 bytes
SHA-256: 41cbd9933c60972bb13212e0648f9ebcdaa30c59826efae444e00356b48f9f1f
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 10700 bytes
SHA-256: 803bfc98164fcbc6022df1740c4abfbe254072420e38d74768143305da2d5ed7
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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