Malicious PDF — malware analysis report

Static analysis result for SHA-256 83338ea786dafc7f…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 05:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10255e800fd7c4ea4d86b8e5e4de73ce SHA-1: dc383318c4b536080dfc02e39e0366b1fecb5e9c SHA-256: 83338ea786dafc7f86b50ea18879199733bc22f51ef21e14f4f1d364cae6b154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=age+of+empire+2+definitive+edition+download+free
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/844db28bb1345686da12e5a6c4897016/79022750381.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a05rd0snii9meqkcqfuqmhoj4/diwatoxupisag.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093d5123c6b4---86115781851.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/384a2bb9172ae3aa00e6793c00e5b90a/vibabasasiwukidevekugez.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/042e3e4e73a14290b02dd57866606787/71557295338.pdf
    • https://reparationmobile.net/userfiles/file/94361400129.pdf
    • http://studioriboldi.eu/userfiles/files/41710040233.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d742a9712---61204906972.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/588cd5111da487c181ece8739c1767cf/kakorivopirubinogova.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/99537f7433f44399d2a4ace93ce748ff/61953287080.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6e5beb37988e077fb2a1188a56cb1dec/27640585300.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/81175367683.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf345201f---46032013150.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/518cfdfcc313f76793b9954a700999a4/18081049088.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/sipotmchot5m5fd7us3ij82ck2/nexiwopime.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/83f7af88b0abd5e8bdb36d5ea7b6aaa0/jovojikojufar.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d65c2e9a4070fe2efc1154289da6ddc1/64864118367.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160965129cfdd9---guruwolejopujojogil.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160712a575512e---75419994156.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mm075ph4vmlfd5hjaomcf660t4/77047923180.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3552012c6e25aee23b038c8c88bae71a/zuwanaz.pdf
    • https://eyetracking.pl/userfiles/file/lazekivenuvatijup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
font_01_sfnt_off00010374.bin
d3c524e513df1b762101d6a29c9537b360a8fb4c4dd1bda3f165513f846f0ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 10924 bytes
font_02_sfnt_off00011ca1.bin
438fe75ab60d9f06c777d17ed8d6ee5e2dd124c8fdf1831da0c8ac97a28890c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 18980 bytes