Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a49c3ae03a83bc7…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 01:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a08afdc20b2df840c7b1bae83c761b03 SHA-1: ff1bb94cf1301204388cbc1aa8071f86d3524d99 SHA-256: 8a49c3ae03a83bc73701fadc44f93ebdc8fc45fbd7253243ef5e0afbc4206748
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=how+to+find+best+frames+for+my+face
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/17049280193.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e476cf1b244b5fff7d5a15567349ddc9/49899824932.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0f622d30---zaregevatozula.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b335f26b89---dosomizidezuniniseke.pdf
    • http://planbmedia.hu/files/lalunawu.pdf
    • http://zerosquareonline.com/file/vajadotezebiwodaligivadoz.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/59a0e2c9628c0c15974d80225e937c77/41820784407.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e977e1f367278ae2a5dcdcf15fdc370b/punopokajarubitabitosaso.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2c5ed5d7---reromuj.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4bc3d5571---ximifijugij.pdf
    • http://hanleyresources.com/images/medaguwap.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/24183289238.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dc3311b97---34879881501.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/f4765de27c90390252577a7cc77e7210/45235938984.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0b6f1a223e3f860be9bd2a8f3a5ffd4a/xerixenorugutib.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f38deca8d---6079758686.pdf
    • http://allaboutdowney.com/userimages/bedefof.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1f10ee68---21366661316.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0674b5f528---sutafuduwitija.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1f656837---rimivebukolizij.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/or5n1g2ec6rmv33p7as5dp6bd7/manik.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/04edfedc85d130ecbd6ab6600fd0e986/xaxanifetojoxixilaxe.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b18151a0---87160926518.pdf
    • http://mnogonomerov.ru/uploads/file/76921505297.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e08cb8d75---jogitiletigugonasim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2a.bin
2b6f3a2471d8c20b8ee5fff57d6477efa1cab5c29acfee88ad79e145f76c41dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 10924 bytes
font_01_sfnt_off00010687.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 16792 bytes
font_02_sfnt_off00011e99.bin
b6dc70981907f478a8a7ed528f10a4a98d1f5bb75d00fb397426824599bd34c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 16692 bytes

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