Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb772e686abc71…

MALICIOUS

PDF

112.3 KB Created: 2021-06-28 00:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c4418bf50405e8f31fa47077b3dd4fd SHA-1: 7bb885d79d84836214e6e92a3b88e7d08f8c0fcf SHA-256: 9dcb772e686abc71a9ec6ebfa94cd580494bc4802c93b77110a0f99d582b0ad7
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely as part of a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7230e8111b---rufuparig.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5388e2bdb---45330514135.pdfIn PDF document text
    • https://ikima.fr/uploads/file/32544592634.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/5149211685.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f5d7284b---79246351665.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da02e4ab8---julojamodoluveke.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bowisenufidizamibod.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4c54i90d4gkf5nquadjt48c21/magokaxizozixitonel.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ffb8249b3d54f04c2488ecdc3125eb3e/33388710849.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b78cdea486d---87035149882.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rejadimaxubaje.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mogojasanoporaxa.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c650243ab59e56a24d86ae036b58b8a2/xowujorebo.pdfIn PDF document text
    • http://aa-nusd.jp/59890539160.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1965392d65---bifasekufabixete.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/k7uo6epufg7fii7amovem21nu2/17203542471.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/43993487fedfa06117da96986e857fe3/26100851452.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9df0a2fd87c1411ecbca06a551ae9a2d/segasavek.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/73872ce0a45df466746aa7f11023a6ae/63459537800.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a063ca14f441d7e44fb4d2559938725f/bomufide.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f9643873b28e5e03c3c5b31cae3d995f/358007803.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4b9860f928ae33388c2521cd1d666a42/xuson.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722291c02ee---53928414260.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb19b5a91---bagusonofilumeguju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=thiamine+deficiency+in+alcoholicsPDF link annotation
    • 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_off00015637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15637 10620 bytes
SHA-256: 23aaf590c83b5a4040d5f38ba25ca3d4e7ef9f9b63f097bd1fcd6636e18e2ed5
font_01_sfnt_off00016e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E40 17448 bytes
SHA-256: f914b65dfe11b4b777f84b39f85edc570a27155e03e625a87c1c99eeedcc1fff
font_02_sfnt_off00019bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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