Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12aed9f26f33b94…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 23:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3edc64f55c79b816e7735211ef28be9f SHA-1: 3b9edd5b9515ee028ae8852d622deb11e9ce9400 SHA-256: f12aed9f26f33b947803a3e648004526b51471222320cd2449111fe711e1620a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://nomylo.ru/uplcv?utm_term=subaru+impreza+outback+sport+manual+2010 PDF link annotation
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a54314319---migurotanef.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcb2d8bec---pebezofuxerofuku.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8295597f3bcfc054eadfaf2adfb3e50a/2463803783.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c79c57a1424---31998534464.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ddebdeb54ef---2783513086.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/58081846251.pdfIn PDF document text
    • http://wjcopy.com/upload/files/larizekepinafez.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/67846757011.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1a3a773a4814f8d3fcf0994c8ae5460a/todujumebuparefopaluvup.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626cce1349---gawenanupekizomanezijulo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/porazaritenoxukudedugo.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/280622912.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/53269074060.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b5e58343b---88403291449.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/27815820538.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/baff469765f32b4beb3c44fa86a97a4f/51002001943.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/75753314954.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107070130104174.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/pizolebaputupamajujudav.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/debulujuwuku.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/20657876308.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/terejuxurodi.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3857636a1---21393059296.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/tifasopizo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/40290221232.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2cb78964---6524741490.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_off0000b90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 15616 bytes
SHA-256: a6b85693ee08bcb4748e14d849ffc7797ec21665e62a534a12e61fec57887f90
font_01_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 11296 bytes
SHA-256: 587359edf5b3f56a523911e53cd3324249866dd57d43091b85157449c91cc3ed
font_02_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1