Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd0260ae3d78aa3…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 15:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 955a572e9f9873f05ba57b709e0bc474 SHA-1: e327405623e35967548cfef8251047e97c2ee4d1 SHA-256: 1fd0260ae3d78aa31b82b9e3059e3e932a3d02792714a590434d9322ec13a556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=st+stephen+and+the+incarnation
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c675a3476d---52423431349.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/724214870d826890fa5f14b49debfd75/36191078019.pdf
    • https://waroproject.com/file/sidizonariwixutovekularev.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8c11faa607773a154a5d84d83c911920/wikiguzaregaxiviresewenu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8938d163---65979745145.pdf
    • http://globalquestconsulting.com/userfiles/files/29772845895.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff2cf02f7---272455541.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/vavafimewijajujerodavul.pdf
    • https://armagedonspedycja.pl/files/file/19144409067.pdf
    • https://alshamiltrading.com/alshamilfiles/file/88918620065.pdf
    • https://hkbca.org/UploadFiles/file/20210607212202146.pdf
    • http://efuturesthai.com/uploads/file/65539292360.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f175c0b5---makuvewemikilewugusi.pdf
    • http://drjoecarver.com/clients/49355/File/86015788162.pdf
    • http://tremonttemplemacon.com/clients/862779/File/nevajarorep.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c808437260d46456c44fd94ce20b2f62/71700259092.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jsd2eo3vqrg872onjbh2q926nm/guxoviduladu.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ppkckscghk5dcfn4al0faq6osc/gawerexonaruremusukil.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cc17fb720e73b3ecd70cedac02fbbaef/vidotanezeguvibit.pdf
    • http://dlt-nkp.com/fileupload//file/vimusujovem.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f476bcae2---86046092219.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b37207e9aa1---jifasugaralazifonaruf.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/740a934be7a93496f9424f92023879f7/78527203495.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da972efb51---73938566061.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_off0000e43a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16792 bytes
font_01_sfnt_off0000fc51.bin
1c9c196fa405c4fefaf86bc9a1e33828fff102815ac9ec2f7e752ed799f79a93
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 10640 bytes
font_02_sfnt_off00011492.bin
16ebba2e184c6b355ff0d25eaf61c783a50d81d68a979ff347cad93126539aa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 18016 bytes