Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c8c813ad55835c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 01:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a61bec15aa5c307bd8b4109887030ee3 SHA-1: dfae77bfd5f34da45f7db46f030d37bba1341544 SHA-256: d6c8c813ad55835cb1ddf46ae9c4a03ef183d68e4f2b12d2fe046bb962b1bb58
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised Content Management System (CMS) upload directories. The presence of these links suggests a phishing or redirection scheme, aiming to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=conditional+sentences+exercises+all+types+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nhlfm96te831aq5jo266jj7vgm/32900903653.pdfIn PDF document text
    • http://alptw.com/images/files/43318044494.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ndtu09ptnenpi2hl78dfq8blf7/88620241879.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/ruraliv.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/36546738350.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3019af7f793087af8e6d4eb08af401ca/50294200799.pdfIn PDF document text
    • https://roc.mn/uploads/files/28032646431.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/wuwewato.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087cfb090d62---44148057575.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/25430536764.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/15747340969.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ee53d49843d033f9ac15bbaec0c1dfc3/53128429285.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f682f1b8150b487df0e6d139a01a174f/27545892805.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/79014921444.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/sipinaw.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60f366975---3688996714.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/90127737974.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/kutatujevuvosuzepeki.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/15785261780.pdfIn PDF document text
    • http://banquat.com/userfiles/files/zalaxibumibozew.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/kumupexipofiwujijap.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/29511611556.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_off0000d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 10860 bytes
SHA-256: dfae31873f502ec9edc7c6c78aaae969b6785679c2866f69d286477e258acc08
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 17488 bytes
SHA-256: 06cb495e8b261ae4b231d579344c8226f19ab945991c0da35e13dd729154efbd
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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