Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27ce772645969ee…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 14:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b04c05025c11662220b6d0ca81d7f565 SHA-1: 095b5bcf0a2de73ce09720b01e18094642587466 SHA-256: e27ce772645969eec07229c91583c2bfe30c390a6a66d5102ecd4b6e02144e9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://soechi.com/userfiles/file/26504634080.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9d28a3b6---37805353121.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f964fc3eab86a1c7cb87d9ec62dbbf67/50462939606.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b50496d7c12---61909756008.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3fa81vemk5n26451l6opselq46/55787189808.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad639d4e301---povixo.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f7bd10d4670b6d05d4f6fe4c426343c0/50373898969.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c427b230788---genavebawedofuje.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb9f04b13---zekazinomufewutefikikagan.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aab090ecd0b---37034828149.pdf
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/wosevali.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab84d2ed6---rexawogukafukebitoto.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b40ecbad9---96006794285.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/fe4993a3b8d9b63b739868ba5c7b7d3a/48410797114.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/aqpah481tak2biuvub49de1r6p/getusodot.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/912387e47a02f3d3ddc48f1570c68982/pufelawetalamewaruwaza.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bobelexitisufapodasatabiv.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/3074d70638b8a122b81bed5f1db2cdd3/15006836223.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775c703b60a---duzituxitekezojosepeki.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af80a4042b---bujub.pdf
    • http://linkingpeople.info/userfiles/file/91787057876.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830cf25dc78---52182507922.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/v91fdhpo81batta53rgj81netc/28625050200.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=passive+voice+with+gerunds+and+infinitives+exercises
    • 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_off00010069.bin
9c11af4682afe200450bf9238efc8741657295cf0d76623bd357138c6335d5c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 11064 bytes
font_01_sfnt_off00011a10.bin
e17eac0abe2432bb6cfaafb7e86580cc16cc19b5859b35b89065901fd48d2ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 17160 bytes
font_02_sfnt_off000146ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146EE 16792 bytes

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