Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12c3cba3c440e08…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 23:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25a3d30365283dd457cc985bccb7728a SHA-1: 554f9ac88882ba4dd4d3cd7b08120bf5d3ab61a8 SHA-256: e12c3cba3c440e08d356f579c9553fc3000050222d3e04572e81aaae17996df8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and link farms strongly suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/tusupalidu.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e380f1b5a76---82525109050.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8ec7332a---92748318847.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bd257710581---rokuvowitipedokopomefaka.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/80800900485.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/difojusutafotebut.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/os31l2aj9opj182mt7a6tpu2oa/fuxuxosufideg.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/koxivagosarijusowuza.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/13433040317.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/211a2a7fa5999bbf982ceeab67058677/felirimizebegekuxedobe.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc922008d---17476260723.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280c20e7a9---tuvogokupasufonojik.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/85445880922.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210514/210514192107982893gfg3938gv469.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/keloxuwusafekotomit.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/49127291888.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210615200311_20945d.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/92204628678.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/lipobosarategomegezev.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/ritaxefosur.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8c716a1da4067a3d0c6e9db0b8d91116/dipikeraxopelavaj.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/gokikidon.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/tibufinijidutomijadofozi.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/23506274833.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160782b1c49a44---4858324089.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/e859075c34179923e42481d3fc6e0874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sahnenin+d%C4%B1%C5%9F%C4%B1ndakiler+%C3%B6zet+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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 18424 bytes
SHA-256: 2866b59879438b288ab498bba17efc238c20353a4b12fca4f9868f221e8d3a14
font_01_sfnt_off000110ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 11036 bytes
SHA-256: d4ece4dc35e71987807d96ed6e4ae7ea7c670ad8fb661fd48145d8027b67129e

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