Malicious PDF — malware analysis report

Static analysis result for SHA-256 3189449cddb1ba9e…

MALICIOUS

PDF

91.0 KB Created: 2021-06-30 04:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e5a8f4335fd67f306729a8107b831a67 SHA-1: 35d16334efbbdf4c4e1b493074db93c391daf890 SHA-256: 3189449cddb1ba9ea61c315c60318032965a161c4c6fd7d3890a48563bb5bfa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160949db38598d---neforajopodididolaf.pdf In PDF document text
    • http://falerisztika.hu/tmp/85721286161.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/jafapimuvo.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/64173459500.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/97496649398.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/71069098877.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa85232a0f---93138388302.pdfIn PDF document text
    • http://centrons.com/uploaded/file/140909020260d380f1590eb.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/169962e7e3d863c820d5eff4f4aaba63/80830440280.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/b4osaagg3rs43ghktohep68t7i/sapijif.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210624064523339.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/55667874863.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa69d8e592---53770799380.pdfIn PDF document text
    • http://turnyras.lt/Files/file/94497294067.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c1035662---kalisipe.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/ff4862f92baf2b806992721189b535af/regiraxete.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6fb9142d7---29699624298.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d1t0er032gq6rrhkjq795ai081/5284909319.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7049a6bc2---89960107358.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8563e2b31ced498e57580296658256ca/dumemajun.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca982a4a5b---todebamuguxen.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c81ff857e39a69c1762bbce963788731/58551824283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+paste+a+photo+on+a+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 10436 bytes
SHA-256: 8237313d314eaa410766ef6844075601b5068404847ea9e812c01f98e1361dc8
font_01_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_02_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1E 17924 bytes
SHA-256: f42e50726c7aaf2ee28f511e09dbf759cf9b8f714a88f751e967e0c47df24830

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