Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7d7b6b96c91173…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 10:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 894a93c2b2ef9c4dd013b3f92f32bb13 SHA-1: 19a831b4d764208b0a6dac072158b84a16d8b3b4 SHA-256: 3a7d7b6b96c91173125fe6996a010b2d2d455af711414a76ae940e6010d279f0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing campaign, likely delivered as a spearphishing attachment, aiming to harvest credentials or financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/hdtg5qgmcg0p46klkjcv1t5jhf/59588542407.pdf In PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/dodimalutubivuvam.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/3589313329.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/29975861614.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161383314b837a---3386073880.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210909_120917.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/60197323584.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/93944387480.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/peweko.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/zufuvodirozovafunilukaku.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rotanox.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/9913775004.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8c7a1160---mofoj.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/41747843954.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/52303074339.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/92087336175.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/saruvusedowevefediv.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/ranesitopuxawifatid.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vivoxagajixetoxefop.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/gosebejor.pdfIn PDF document text
    • http://huntland.hu/upload/file/wekaxutuvefa.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161343a61aa43c---bozuzojabaw.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/nekasolasovo.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/zideg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pro+creator+for+androidPDF 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_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 18196 bytes
SHA-256: 1172f18f91204f39573aa88cf0cea153a6267313b41853f6de82621e4acc4b0c
font_02_sfnt_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 10256 bytes
SHA-256: 9f3849b17b078bb1d5ec02779bc451e59e1477279d71284c78d1bb91a0148ff0

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