Malicious PDF — malware analysis report

Static analysis result for SHA-256 389cc38a1f894c9a…

MALICIOUS

PDF

78.0 KB Created: 2021-06-28 23:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 64ef22c49faffc6041f32bf08786e1c0 SHA-1: 8bf8f19ee9884ad8097c3f66bdaf01183b4b92be SHA-256: 389cc38a1f894c9ae009c4e60d3012e161cfd7a24821b9bad4202c831d5e8b1c
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 compromised WordPress sites and other hosting platforms. One URL, 'https://chcial.ru/uplcv?utm_term=fifa+mobile+coin+generator+without+human+verification', suggests a lure related to in-game currency generators, a common phishing tactic. The presence of multiple links on compromised CMS uploads indicates an attempt to leverage existing infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=fifa+mobile+coin+generator+without+human+verification PDF link annotation
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1k93jf87mbduchtb86n87cn6ms/29480918430.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b160f6078c8c94c7fb3c30da9444c6a9/narugad.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/xoliju.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079d729517bc---kadafejo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160814201d827a---gojuvimujitegetom.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/nmfpiokkrh330sivfif4t6g3j5/zeduzudonada.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/zufonu.pdfIn PDF document text
    • http://bscartridge.com/pic/3921756806.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/85076700576.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e6918396975e3fb035db96e72489f5bc/tarowumutigifax.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/va03k2geev2plik3h7039bh0l0/56678115079.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd84e993b---vizar.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2e0d6106---sujesitulasivakepu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b116270993b---pinubibez.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/doluwekojiv.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/0ef7776ade57c7fdd1c2ce48e83a4239/kobawawo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7fe13cc7cf600a0eb8698b90b36b3358/sokorokitovut.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc122036695---jilomisazugobaverumut.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/tixew.pdfIn PDF document text
    • http://intergeored.com/upload/File/36115457494.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be89cf16eac---pujanifulalekovomidazur.pdfIn PDF document text
    • http://teifsepahan.com/files/file/99201103024.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/37776728955.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/db660a785f10be45cfe2f2f8d0cf8fe4/fawezekoxagalofudakaxo.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_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 10984 bytes
SHA-256: 73859aff36fdcf16c7a45a127f4f1f5be3bf33e241e001eddc790a9f1e1b355a
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 17228 bytes
SHA-256: eb18b06544f2f79c95679071481765476b902b81b975ba6d786e49da324aee39
font_02_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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