Malicious PDF — malware analysis report

Static analysis result for SHA-256 912d8d8f97c8ff8c…

MALICIOUS

PDF

79.9 KB Created: 2021-06-29 02:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad888a9535d03748f2a15a90850b3e0f SHA-1: f396eecf0a4e8eac8e78edc08db63e9e3faa0bcd SHA-256: 912d8d8f97c8ff8c46359aa3e9a046bdc58d63c7462dd395a3415b2fa3ec6365
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://zegabilisim.com/calisma2/files/uploads/70710121693.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/0eb25c7d7fa377d595b09217d1ac4a8d/73113174053.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/505bb708c3e4a189f3596c5302b2e4e1/31887542948.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/5762698258.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b825c4a2fa3012e07dd016921239866e/zojozijog.pdf
    • http://brenno-tojestto.pl/userfiles/file/guparixu.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/96871613974.pdf
    • http://netisiletisim.com/guvennet/resimlerfiles/mutamumogomus.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eaac30a29---fugozazijoxofijefu.pdf
    • https://ms02bet.com/contents//files/56694183248.pdf
    • http://hnc2.com/userfiles/file/nogaj.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/33823752090.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/20cd50ca123cc4e9ccd6b97fc3938cf3/batanilununura.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4c7e61cb6f1d71aad4fbf8f3651523ff/35420472345.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/teperaxavavivumiravobod.pdf
    • http://bettaletroom.com/file_media/file_image/file/78013972047.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b175c358---sifamekubikobudopo.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076185fc6988---zokajegatesifipasomipu.pdf
    • http://aarogyamedico.com/userfiles/file/45014002191.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a0a323236---57806729933.pdf
    • http://ozari-ua.com/files/file/xuwobuwizisojiner.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/gumorileruzozudosuki.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa23c6090---mufadisizevamibukemomerux.pdf
    • http://akcjonariusz.com/UserFiles/file/dozugexulubozavirigupapin.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ellmc8ev31rs6i7t9ukjgv9t21/polafiz.pdf
    • http://akinmedikal.com/uploads/file/dalidemefomonogezasit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chemical+bonding+neet+previous+year+questions
    • 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_off0000d12d.bin
dff822c60f624d7995383e6dedba72c0b5ea14fa5baa709b9a7c2df6b64cd62d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 17648 bytes
font_01_sfnt_off0000ff15.bin
e6a2740336f516c95e07881a55d2a5911634cee3df8382fb4e204934d4149adb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 11556 bytes
font_02_sfnt_off0001199f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 16792 bytes