Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db61247ed0957fa…

MALICIOUS

PDF

100.8 KB Created: 2021-07-26 02:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3428de32fe264db34188a30f7dc7350 SHA-1: cb6e2a7e40787e321a682ee259e79662b14cc2a2 SHA-256: 0db61247ed0957fa0850b878b9b437c91eefe8ecefad1d8873ff28ab73f53a75
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, likely aiming to trick users into downloading further malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0513d5d618---48008684840.pdf In PDF document text
    • http://granitemountainranch.net/userimages/sumunep.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/59d416d1be138c3f2a14cb47fcd0c85f/54425037238.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/60942448373.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609107faa4032---55764510828.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/48175597114.pdfIn PDF document text
    • http://attlas.center/userfiles/file/94730875570.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9d02eeeeebf37012eaf53638c45816ca/tatubejuruzuxobu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9dcf061d4---lexoxumumere.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acca35d0d49---6254107801.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f523face20d---26291859285.pdfIn PDF document text
    • http://intergeored.com/upload/File/misuvosuvulogibured.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/xivuroratisogibesapadaj.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/moxofemupumuzozibe.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/nuditibegotel.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db5ab16a36912c88379b104c65d86a10/22814549421.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/51302179114.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed507c3398---videsunevivavow.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/6594642744.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da367404f2---pejiv.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8426d56d0---kavozumuwijivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=el+vendedor+mas+grande+del+mundo+libro+completo+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 11148 bytes
SHA-256: 16b82ad57fe8b90b391e84ab72709e43a38fe3a66b477a11ba240f9bd2ce230e
font_01_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off00013dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000155be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BE 18284 bytes
SHA-256: e873ddf31b028b1b93e81954d06d60812c91dee038518fda90dcb817311dd8c7

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