Malicious PDF — malware analysis report

Static analysis result for SHA-256 d460e541d1766c3f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 13:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 220ed4c874ab4a2b3b7e965be091cf18 SHA-1: 53685de7438cdb69952c108e2cb9f4c1e94a0c06 SHA-256: d460e541d1766c3ffb5af31735a6bf49c3169d2d06e8a0cae31c4790f2776acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download malware or compromise their credentials. The presence of embedded URLs and the 'link farm' heuristics point towards a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=messenger+latest+version+apk+download
    • http://eg-connect.com/uploads/editorfiles/file///31832601072.pdf
    • https://atkarisuli.hu/userfiles/file/dolotefobafudoti.pdf
    • http://seamcc.com/UserFiles/files/jesadamiludadosupu.pdf
    • http://premiercontractinginc.com/files/file/1749067229.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161374c70c0f7e---66695414720.pdf
    • http://klemanpince.hu/files/file/67786817228.pdf
    • https://chupwo.com/editor_upload/file/merib.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/333t27mmqb38e2001agk8ahnu8/5192570209.pdf
    • http://eshop-kocicinadeje.cz/files/file/pipolamezizegu.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132706467a08---96825835934.pdf
    • https://medtek.vn/storage/file/zegikirotatededujo.pdf
    • https://membermimpi.com/contents/files/fogofupovafujunipawe.pdf
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210906_135135.pdf
    • https://rainbowprinter.com/app/webroot/files/file/26294726588.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e385aeb00e6a658b599e457a451b0240/37805448603.pdf
    • https://hunglivet.com/uploads/files/202109121257394547.pdf
    • http://form4concrete.ru/pics/cont/file/63417245461.pdf
    • http://leaguengn.com/userfiles/file///bodozubewin.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373dec4520a---gisibaxavikolom.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/36384680073.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/62fd676abb2e1058a8e555ad1b67835f/sijijenofoniwekigini.pdf
    • http://josquin-capella.de/download/zakisozojaxegutugevegagux.pdf
    • https://granitabrasive.com/editor_up/xobajadaxunokani.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/98745983390.pdf
    • http://kotrackusa.com/fckedit_file/file///20210916_17_41_46.pdf
    • http://actybrain-consult.com/Upload/files/61929916264.pdf
    • https://konyaalotaksi.com/userfiles/file/49008915728.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_off0000dfef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 16792 bytes
font_01_sfnt_off0000f806.bin
081793cc3ee05baa5f42a936d798e1f7e3b80d08d1af3f8bd24486bde9ac3dff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10804 bytes
font_02_sfnt_off000110e1.bin
f010be3361c1f0c1a298a5e90cec3106517b67d82ef0d9c84223ebb42fd27fae
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 18020 bytes