Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda161ebe9fe1930…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 02:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2265ca68eaa3fe67c20d6ee92dffa560 SHA-1: 579cc029874de5c87ccc64402ef977c40f3a72d2 SHA-256: cda161ebe9fe1930bfbef6f8c11928e15fcb95bf8e89b2a49259662a3d44548c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=happymod+android+app+download PDF link annotation
    • https://feldmann-spedition.de/pics/userfiles/file/zarujumogulevuvupetetu.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/45715212900.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/gusesutisori.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/697b644qo3rnl02h230p8lo1qi/sirizozotivunifawoxutaj.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9cf8825d---wezosavuveniw.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210601125425.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/aa17fea61fcb0b9dcaf485d9a887e847/78423134685.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070caf604d92---rapukibozegisumumubasaxe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/180406a328af70a70882b5d7e05123d9/70887728625.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/26015218003.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/vokugubojavumew.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf405e8221---74691948132.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0bkjblj44cmn7n0svv7c8tavk1/lenabipativunokitife.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/52285796777.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210621_D9377629FFF379FC.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/favamesezug.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a6ab5ac1---66914939066.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/260cb2c210fcefbebb25ba941305049b/jobemula.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/bbdcb2544c86d2691d7581f63f370328/88890571677.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c48a364b1e2---82715877533.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/49dd7c66354557e60888c5e39a42e323/dagilowamojirojijubopati.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7101a00023f290590e40ffc1e4d6a8c8/31731774971.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/fixonopufusobudajupulob.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b867ecb4174f8e188e1a18bdd6ef10f2/54737426030.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_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 10348 bytes
SHA-256: b7bf308496a38ba62610958057e05620ef95ee0dec5b7ba8d650bcadf61721c2
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 17104 bytes
SHA-256: 770643bf6e4f5e2f1f2fc20901b0292d76489abe2b391b3230b5b000d324baa7

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