Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd510166bd29ff3…

MALICIOUS

PDF

108.5 KB Created: 2021-07-08 21:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82b224019770cd7e4ac4047effbc07c3 SHA-1: 560c859b2926378523c2d8335eae96cb1698479c SHA-256: 4dd510166bd29ff3701cbbcd3a0a827f1d2080d14d7d984e78f1c9d43833e670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://oniceh.ru/uplcv?utm_term=james+chapter+2+commentary
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/35954b88025e9dc15a8b8da47ab447e7/tejavovomowuti.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e63d6250---kipevubanivipoxe.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xaxirimabuvejikewubawew.pdf
    • http://anupbolivia.com/images/files/fivezabovekolerisebiji.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816921a9ab---dulopiwogowogabi.pdf
    • http://biplano.eu/userfiles/files/16336626353.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/kifufawuxogovakur.pdf
    • http://beamstraffic.ae/amb/userfiles/file/pojuxapozexuze.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d894cdb3f68---wozotexixubesa.pdf
    • http://fotossc.pl/_files/file/35655512738.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8fb62518d---diwodiduwolazuxikamufok.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/378cbba90079eb1db706c4dfb7831824/dozanip.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa239a315cd---daxujitebedazedelemez.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607635a961b95---deresijepirokojokarurekaz.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37203d3c92688ec5d8c06e2fd52fb38f/29474354734.pdf
    • https://alternativecarrepair.com/userfiles/file/vogefuxinuzewivezivimenaz.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/b906k1drdvqqu75uaer90tukde/lokiwagibigewasavo.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f5ee1a62---nexidemulibija.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bbb1f704---kewudowugowiwafuwovaluzik.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06d0098c16---weroki.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1354a84a02e9344ec1c150b36a62ebda/biroweverez.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qc6mdlolfoqo1ppa5m8vet1n33/memiwitade.pdf
    • http://pekingtogo.com/uploads/files/23644267666.pdf
    • http://dzstock.com/Upfiles/file/xusofatefiduterugeza.pdf
    • http://korvet-sp.ru/userfiles/file/29412355126.pdf
    • https://laughteronlineuniversity.com/images/upload/files/758350065.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 16792 bytes
font_01_sfnt_off000144ee.bin
665a5553738a92abeb67faab31f117d9692013b625bc34dfae4cc41e6a72c22e
pdf-font-stream PDF embedded font (sfnt) at offset 0x144EE 16428 bytes
font_02_sfnt_off00015b85.bin
f3e1446c3e9ab8a0e3db01e6d79d1c7e70846e3f8ae1926b653dde1d83dab33a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B85 17848 bytes
font_03_sfnt_off000189f8.bin
c55ccb0dc4f8a7a7dce3b01b56ae45bd84810d1429a055117b4ceb8ce257773e
pdf-font-stream PDF embedded font (sfnt) at offset 0x189F8 10728 bytes