Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff336998749d3149…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 20:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd496e4dfbb71cb2ffe3a84dbfd9ca59 SHA-1: 578856174926cd67b7e37067a1e29864c8bd010c SHA-256: ff336998749d31490be364c517a74af82c625a7229f7668c2ec92c087611265c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://0048.pl/48files/file/39488944907.pdf In PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jexakuvuni.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/radiwowatopibutodiwe.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/94619866060.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/totukibovo.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/zabevagabopal.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/34ed655dfcf183248f9e39eef627b1ec/mepomatatokived.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/daxupupolifevig.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/renilukaxulagubedubas.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/66612778153.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/13199803815.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/5909623720.pdfIn PDF document text
    • http://contua.org/userfiles/file/57518202657.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/82004573216.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/21678202869.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edd1f9a23e---kixewitupelafijiweli.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/1378456221.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12c3e49bb---89710209818.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f230de276---gokad.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/79539924867.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/60062016327.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/meverigi.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/72301289442.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zapasesejuvosizejusamabum.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632210842.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/jikamipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=putlocker+the+officePDF 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10192 bytes
SHA-256: 9a668c74933e5319507833437c17ff3a8850f6c1c61dfe68e108f4b80b8dd3e0
font_02_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 18888 bytes
SHA-256: 3ab11388fd54854823b1048c1a04189c41b19e51fdd90fd27db3fe8a116e79c1