Malicious PDF — malware analysis report

Static analysis result for SHA-256 93882e467b66f2f2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 14:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be75bbccc2fceffdf70f75242279f58e SHA-1: 0919ca4cd4ad3a7ea064ac7c984142bbc1db1166 SHA-256: 93882e467b66f2f2fb7e51b06757066b33a85c97a2c97d8cdbd5b91200a0ae65
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point to a link farm hosted on potentially compromised websites, likely serving as a lure for the phishing attempt.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8162fcd42b2493f8faa42f043b71c1d/83243676577.pdf In PDF document text
    • https://actorconseil.com/files/file/69919707886.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/sorizenunariner.pdfIn PDF document text
    • https://tivicom.vn/upload/files/tojor.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12593746358.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81716356122.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/litojidewuwivetenuwimo.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/laxenisowujomefof.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/94195238645.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cebd373cbc8cb67464ffd73095a2272a/1411399578.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/97470684054.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109021214103198.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/57341719300.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_044539.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/9648203077.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/17949248193.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/dejegikipawejex.pdfIn PDF document text
    • https://ocw.tw/uploads/files/fafoguxikofon.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109032021441384.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sisuvorefusivofux.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210909165616.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/judaxor.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb4837226---dofejab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+disable+app+install+from+unknown+sourcesPDF 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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 17648 bytes
SHA-256: 3e203812aeb0ffccf838e0a6720820b29e512e3266dac693d34e739215ab5e37
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 11188 bytes
SHA-256: aeb0e78e0dd531c12914703339fed62cd5fd9a2c96ac939b752c953b3be73bb7

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