Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bc3b952f0134b4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 13:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 229c2683f40d455347f9dc14b801fcf2 SHA-1: fa01eedff791912f2b0d0498c11acebe1b627f9e SHA-256: 98bc3b952f0134b48ad7c07e58e5a3ab33bafc9ae75da4272f713d51e0ab9e03
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the presence of multiple external links and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content or initiate fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://czerwoneiczarne.pl/files/file/1980378875.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4553656a---botobiwurigabelaxonof.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/29169338615.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/kalawuruso.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/69175817856.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210907151940934311v0b4cpbu1w37.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6575b4858---55948380294.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339937980b1---jibeziteterura.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/74391088996.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/rivekapuwamexakurugagus.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bca38eb979---57093764214.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/27192294426.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/muwitalibukewo.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/53945042918.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210907141502_64cggw.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/sekesolafemo.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/pikevunipajupelerotonivib.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c325c065e9---26748534619.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/wozapadatisisugojal.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/29507989450.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/temekakudanajofup.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/gasesekajo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6b6cecc00---33631285038.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48fc71a39---93450259981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+tv+photo+viewerPDF 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_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 10248 bytes
SHA-256: 2e6420c7d4773676d67a8582b272c334e1ee6dc824e24b7f75eff2a6f304a39b
font_01_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 18088 bytes
SHA-256: a8ef8012a03d24ddf9ecc92c000e64f683ebe247e5f6fd75590f10f587e6a54a

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