Malicious PDF — malware analysis report

Static analysis result for SHA-256 078ddba826a31f11…

MALICIOUS

PDF

96.8 KB Created: 2021-06-27 08:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f2cdb624487339dfc0eea035ed6351c8 SHA-1: a4013d2af1384d8e96bac71938738e21607392ed SHA-256: 078ddba826a31f11a747a9308272f34e374854691e67cda96d83b274b30ebc19
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the heuristic firings indicate a pattern of directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://synerhu.ru/uplcv?utm_term=in+the+circuit+shown+the+energy+stored+in+1+microfarad+capacitor+is PDF link annotation
    • http://sakem.org/userfiles/files/mamutobumazes.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/1186839350.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d360c93---towivubetosivoxalosupeje.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/magirosojoxabuni.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886e6144001---9432680715.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb3590155---37368185342.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3afa4b43c520e28bf4cbdfdbbe178aff/xupaxudejijemabaki.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb156489e---43823801270.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/27rmn6pusl3r15aauc52ctcn7v/jisuduk.pdfIn PDF document text
    • https://people11people.gr/uploads/File/19615445291.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/12448498963.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8a21b2c39---finajujujadefabutefe.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///40820269970.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31422d91c---nizumumikineketagezefag.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/pirozemozag.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/medinadofuvuxofegu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4c693da214f4a3c49dcc63c171b1eeb0/lanizarokedovuvemejewow.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213ce9d652---nosupojokaxilit.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/bivexusupemipusutebodavu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929e0563bdc---97420288863.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f34cf624af---94001547083.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bc7c4a66399c61cad52901f551ab28a1/30837421745.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/3iopg5vf8oulbkggq0fhji653v/sezenidukovezawekemo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/68804dfc7e265f2c7782bdd2861e5b5d/diwuligaretolilibipux.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/dinesenusefiz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a3147951df96dc7c38a6cbd0efe07c3f/fanibu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/j9k7aqo3b801l2tu0kt4f806tl/nalifem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 17132 bytes
SHA-256: 332f4d20f1a4d18537836434509273405ed0c3ce3ecf82fb54f28868e076426d
font_01_sfnt_off0001427c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427C 11324 bytes
SHA-256: 267993ccac548d5e6b26b2d7ab24339e4d03a74ff6abaa44e8b01d2908bcd457
font_02_sfnt_off00015ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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