Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5c7cc31d3250ec…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 23:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c688dfeadd1e9c654ab83b3928c4353e SHA-1: a39400043c7f1320c0b0658e16a0684c0c93e338 SHA-256: bd5c7cc31d3250ec43bf1b366aaba75ca29aa8ecdac55b820ee841720d3cd44f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs, many pointing to compromised WordPress installations and link farms, suggesting a phishing or malware distribution scheme. The embedded content, though heavily obfuscated, likely facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=vcm+200+victor+pdf PDF link annotation
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/73247893311.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/30006985334.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/90164962508.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/977038937.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/527438a3e00876b0d3e258b7e6cf1d2c/guseluzejofu.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210630192213.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d94244edc83---84324352628.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081f12f521fa---91143281459.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/55629759076.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f7479f41---33635594994.pdfIn PDF document text
    • http://simonide.org/userfiles/file/rapodoj.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/77716057903.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b308fd91---tifipedirelemepi.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/vixekeb.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/81694824490.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/70469530752.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608adcb73a24d---duzesokexakimaja.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jivaxefib.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/18p69n6p6lckd6g16kmclruhu2/13337637162.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/58896425983.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdcdd9c54---mijazobupejesi.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/28208087420.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_off0000b7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EC 16600 bytes
SHA-256: fda36499b39ed706568b12f34e0f18278a59e68defb6bbe5ccfec1b618dcfcf4
font_01_sfnt_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 10444 bytes
SHA-256: c58e695c80fd74c0b54be4f0c44d4aadf50cc2d80acb56459acf73f08bbc1466

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