Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe5e76b6fe3db71…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 16:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f231354f41e774210dd90c66d93f620b SHA-1: 697b149d31949f280838d201724bf07b1a6e72d8 SHA-256: 1fe5e76b6fe3db712ae689c136b8d45f3062c24c39a0cb5d63a137b62079b324
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains multiple links, several of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the heuristic 'SE_CALLBACK_LURE' suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eltdb.com/UserFiles/files/9558033505.pdf In PDF document text
    • http://vo23.ru/upload/file/20854159464.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e391636df---rolerozakotororof.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/rosebilebox.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/55239937915.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090318054253.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613154927258e---43583724444.pdfIn PDF document text
    • http://sbairs.com/datas/files/natoronegumotawasibugiko.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/41692350843.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/32596672938.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/vovuzuzubutumodoxu.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/94598508658.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zibavijadanebanume.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/vufefuzedepi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2555cd747c1ff61afccdc8d9b871ed81/85250104780.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/78939f4f7c89cca817215d50ff50ad14/rajig.pdfIn PDF document text
    • https://cian.hr/userfiles/file/bavasawukadubifiwiwajuboz.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/38860510930.pdfIn PDF document text
    • http://ave-france.com/pics/files/5189757873.pdfIn PDF document text
    • http://geneolock.com/locktactyuma/userfiles/file/vipivizumo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/zakusoseladakid.pdfIn PDF document text
    • http://888chji.com/userfiles/files/lutizuvopezuluvubopo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/29572403541.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/levigodelujerabuj.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efefc115d8---42989164665.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb75232a5---71161095349.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75180311044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=score+creator+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_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 17452 bytes
SHA-256: d6664e18d7f7c9da3c68d41e57cdf27306128d824ee7d06b38acdc675afd1e4c
font_02_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 10124 bytes
SHA-256: 21495dc19e60bc1da0b9b42243b92773833ad12178f8b6c5347972675e40874e

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