Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc385173e04b91fe…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 17:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f03de55c123ed0f98bd02d33b0b82cc5 SHA-1: 4e301645db55027a80efaa943b9d3eac22e2e195 SHA-256: cc385173e04b91fea7ba9a1407361ca4475002d212dca9c364a877edf857a6a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=world+clubfoot+day
    • http://28777886.com/Lpf/UPFILE/userfiles/files/wixoxonazezodorave.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed6ba1474---67291721787.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/tefafofusibam.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/86649116813.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c290d0349f4---datowubixa.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c12i426tdrd3qfg0g5j9t8f1dj/kozoxilewe.pdf
    • http://stark-tools.ru/images/uploaded/69753091412.pdf
    • http://automsystem.com/UploadFile/file/20210623042804435.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609657da8bebd---wakopunopowuzas.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb6f33ac4---puxuxosa.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160946432c152d---gipagegijoli.pdf
    • https://guapa2.com/admin/fck/file/54226334540.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c9170976---70006136064.pdf
    • https://diedacorporation.net/freesiafiles/file/3908108355.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1e0bf0e6---86984975934.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff2c2f2df---tagapinidaduligufosutuv.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ci7gut82l338dpuhskmnbperch/26030138267.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b5eb3f569---78361618714.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af7f1dd6f8b52880d0f4520ddf266f9b/lonidujem.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/kurebokejerumimudobed.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc755994e---danoporazemefomeziso.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/11051110244.pdf
    • http://www.alfapilates.pl/upload/file/rulixitow.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cf945a51f67bc7227c05257b0c59f7a9/91145572310.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_off0000f191.bin
11fd79924d661892cf7665f14cddd9fed6d94167f810723dbefdb63649ce08a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 17336 bytes
font_01_sfnt_off00011e63.bin
be7017364869369f3f238251fcdd04b8c53aa9cad0560493d68d42310ec3e0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 10320 bytes
font_02_sfnt_off000135d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 16792 bytes