Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b14ac330a551b7c…

MALICIOUS

PDF

107.2 KB Created: 2021-07-22 06:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: feb7ba098a12c1d8332f01d0a386f6b4 SHA-1: d5398fb9dd524e88562e802ba316471bf2a5c0c2 SHA-256: 4b14ac330a551b7c22832193e104dc319afd8a983986be7ccc5a5b3f832618a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4c7a92cb9e9ba696d688178cd2fbda3a/zekufatemagilepagapapo.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/10ca9af000193e825d28cbcdf4aa1339/21814761762.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/nowutefugamujupimivakuwij.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721fd1cd1a6---jemumugerikovorivojov.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d31fea909---30667112959.pdfIn PDF document text
    • http://apcmagon.com/userfiles/mozude.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2c7f912ac9d82ce4ea3f675085191c90/loretagem.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/rusekunebogi.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/77907630772.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e95ab9fbb6b72146641a47bcc446e000/93024330090.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e54d05c1916---39690481180.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zolot.pdfIn PDF document text
    • https://zzhqhi.com/d/files/xupelaru.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8f8ee0855904d32aa7cc6d844b278c14/25508216518.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/72823814578.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/sepobesipoxegenonuz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/81859700537.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30558687351.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bl0udlqbofh6qnau8n8gef4gkh/temazibudomidanabelubuzed.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ccce5667b55cdaf6cc5d14149a47953f/67200574791.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/majugu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5b3802f795b5d40a0f7eeb774d84f3e1/27593465020.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac684d94e---senuxodozosa.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b9bf68efe---wusokiwolulupivudilaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=30.4+blood+vessels+and+transport+study+guide+answersPDF 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_off00013a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 11412 bytes
SHA-256: 15a1176d097ee0c92a01fe7f9dae3f665ea86adb03e8f4cfb6e8d6e8744d4a97
font_02_sfnt_off00016cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD2 18696 bytes
SHA-256: fd59ad5c7a483c06996609ec424ec75a678c6e5b1f25d4d58b33ce14d9707529