Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2951db90e35638…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 19:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94c894a69556d9cba862d4816ff2e7fe SHA-1: 76e0ea0d0c2462ba58f76308f298e69fa55d5352 SHA-256: 8a2951db90e35638dfade9e3373f0b82accadb7829127faf8867bf8f02959d6e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting domains. The presence of a download button lure further suggests an attempt to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aiswaryamatrimonials.com/fck_uploads/file/balodeb.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7aa8a4596---51970345268.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608356c5e0817---wuvok.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/genokokogamipewezowuwugir.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/c26m6nf0fhn4fcec02icesguqq/97383465804.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/81102546306.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1cf0346e---banolid.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e8bacd93c138390226b246313a77a498/36246387210.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/fesuna.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608653b755c2f---tamupojusaturapuwafisalov.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/990bf814a032aafa358be47aeb8fa000/fozal.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/worukolazibanokofenex.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d29187c24e7---48677775560.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d5e7cac6b---wisavemitopivigovi.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9cc8b6c1ec0a53c23ba27ff73899f360/91590281912.pdfIn PDF document text
    • http://arslanemlak.come/file/rirujetifen.pdfIn PDF document text
    • https://flyags.com/editorResources/file///23007685232.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/27a845q9e6rla26d00vt4crub6/fezetom.pdfIn PDF document text
    • https://shibbirs.com/media/files/23587744019.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/bowuwaf.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/49616617851.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082920b3427a---8279395908.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/71491929591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=imo+apps+download+for+mobile+apkPDF 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_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16936 bytes
SHA-256: db70c5046d693a3ff2d5a053f63335adf80fb9812fbde0128a00b0eccb87a0c3
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 10832 bytes
SHA-256: 8b7396699ec66c0bdb8e12570b19d9542b1496cded562d40735d52ad51df7663
font_02_sfnt_off00012f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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