Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c4c912d8fbc2e4…

MALICIOUS

PDF

81.8 KB Created: 2021-10-12 02:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: baefa3801382200efad3c24bbc02d6b7 SHA-1: 058df55bf13a9fe67bcdd99dc63c86a58746e2ff SHA-256: f4c4c912d8fbc2e48a04b66941ab88468648fb46899eeca32e0e9ad980447b92
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://xhzhengli.com/upload/92289575274.pdf In PDF document text
    • https://phuquiland.com/upload/files/99858705052.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/45151559511.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/77667132624.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/85536193104.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/24348643300.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142e994882cf---97404601315.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/62607809516.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210918_633A3E7861BFEA72.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/siliwa.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/28361898313.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/32e5f23d50e8531dd82b131f7d796a0f/pekinisezowetomonegawan.pdfIn PDF document text
    • https://icbacademy.com/upload/files/54853863940.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/58086723677.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb5994c35e---gipufeka.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/55632300092.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/56324668619.pdfIn PDF document text
    • http://rogatka.osieczna.eu/userfiles/file/debabazazesuropali.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/56721929082.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/62406071724.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/jilamizezizowimuteberunu.pdfIn PDF document text
    • http://ruihuitax.com/files/file/94082855308.pdfIn PDF document text
    • https://insp.biz/img/file/ludusukiwijujolexoxokaf.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0df5b104---megefevaxokunot.pdfIn PDF document text
    • http://hnspkjx.com/d/files/nodovodadovodu.pdfIn PDF document text
    • https://tempegaring.com/contents/files/42335084314.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6834a753270147221440bb9742a85c9d/zedalejuripomumifezugajez.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d01b8f3544---gejorujinuzuxudezilo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=study+routine+templatePDF 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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 10676 bytes
SHA-256: e89094389322197ffa8f17a23ed14d123d681b10d0a1c03324e56852a5809e2c
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 18784 bytes
SHA-256: 97c960becc1f6d0d9976df57424ed829da042aaa6ba9587d745dff801dacadeb
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.