Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c85b4b4ad129bec…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 01:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: acb39eb24e251c50c342cb34999d23ed SHA-1: bc722a52dcc552b5b168a279f526b76006894705 SHA-256: 3c85b4b4ad129bec4c5ed00ad1a32b018f4d73369571cda2a817225d965cc074
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://basyapiemlak.com/yukleme_klasoru/userfiles/file/mofajijulujozen.pdf In PDF document text
    • http://ongxoanhdpe.vn/upload/files/jukemabomopiwetubenox.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6872c412938c1b0d2f889017b2dcc68/kivuni.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/jobun.pdfIn PDF document text
    • https://andhimazhai.com/images/files/6817864807.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tapotajulivuxew.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac13601d34---34005086087.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tirumodogodatuv.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/49170074721.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/133efd851714ea688a38fcb34be6022d/segifebexenawu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ee1f3559---21614242750.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/uvj6vj5cg8kjod49t2ht4ha5o3/62122466489.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c535d731d8d58b2ccf53dcc765613a0d/folajoduxokenexe.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xewunafilowemajoripipuw.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/pefimadizenunoxemefatu.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/25634525064.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/walitumikat.pdfIn PDF document text
    • http://vinmexindia.com/uploads/vujimegobenuro.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/bagejivovasi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kb335n6t1djkka4c36jehh0eer/sufazigewomamabope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=2013+vw+cc+owners+manual+pdfPDF 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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 11212 bytes
SHA-256: 2e729349971f15ec641ad105df0b01946acb2cfc8be3b769c6ce4dd7b0c01538
font_01_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 18404 bytes
SHA-256: fb4695672f7a06af9ff68d28747c07e605cd8f3871c1c60c76b40fad318d4bb5

Open this report in the interactive analyzer, or submit your own file for analysis.