Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52c60558250328c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 20:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbdba5428a8ee6141b9957e0223f9c79 SHA-1: c7492cf0e29cc029b126305a24bbb133bf722bf1 SHA-256: d52c60558250328cf9855522b4cd4ced7972e3479b615f03ef0dff0c36ee21c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to external resources, many of which appear to be hosted on compromised WordPress sites. The ML classifier strongly supports the malicious verdict. The primary attack pattern involves luring users to these external links, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=reading+comprehension+worksheets+kindergarten+multiple+choice PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1611a15b5da23a---89445796539.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/427ac3074442b788135fae0c57fcba0f/10863423722.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/kugowu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f222a8d70e.pdfIn PDF document text
    • https://cargotavio.ru/files/file/nenememivifu.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/bawinunomulurig.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/396571eb121302e1403860b278346b4f/lajamazipewaw.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59646329c---kozovoniwowa.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/59841510867.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183eec92db7---nujugakaban.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/3l5aah7ggbl27gk1jkie9g178d/nekobamimefu.pdfIn PDF document text
    • https://senfina.top/uploads/files/53553350442.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/81754029480.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/kunuxisefage.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/vezamameduwusemapiwuruvu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gul0ig3ofcmsqraodibsus5ii5/kozek.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/on3uhv75ourcl8okcu722nulm5/serozagumozagejenanafupaj.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gdo912ot299i4ltgddq2v1gsis/xuzuri.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0604/678d5546d0df4deca08722b6ea30e7f5.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/bujubutozulukatuvupejur.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/kibegazo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b6a9511db0930b516718f30bde8eb3f8/xuturomuwuvotesovajuda.pdfIn PDF document text
    • http://ud2-140.com/files/33429353638.pdfIn PDF document text
    • 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_off0000becb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 11284 bytes
SHA-256: 4906045ac7150c067f568f779e767cb9fa2553e1f0db1aa534a72ee035ebdb7f
font_02_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 17300 bytes
SHA-256: d66af3aa4d2116548ef39ace8333c0cfee57e6f1e2c4b3f29e267a3979a3bfc2

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