Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d434c40bddaeb76…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 00:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 54851dcf00bd9ef20ac9a4e5a1a6fbb9 SHA-1: 448c9630d6101f55c9f72e1b43fef2e72d180629 SHA-256: 3d434c40bddaeb7611d5f1daa7ec4883fba1ee814d721252e8d3dd82d8bd24a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075455c78a25---14957288318.pdf In PDF document text
    • https://anmoul.com/userfiles/file/82673123642.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/m7l25sha88rdr2krvuncco9sau/35394493865.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/6453177915.pdfIn PDF document text
    • https://aitalk.vn/upload/files/nekiwisinikeberilo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/10826432231.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798027941d6---93997595560.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0dddfe5d01b62ebcea11f4b781dd24a8/bosuwanifed.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/64923390457.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gu2f4c2ujosu794tdj18gasl2c/20319210455.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea0155c69---zibebimipob.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/4057512707.pdfIn PDF document text
    • https://windsbs.biz/files/file/18288696813.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/31b55a09abae81e9e40c19fb43a03860/zukatunudotot.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16aebead1---romuvabu.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021061916482773499.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/beterepexuregofijogokugu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abddf2729f---semejirorotivikatamuluvos.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/406d3258d0e1ebe28cb77329e5740d5a/lemitasekimonutuzenakivi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096bbcf97128---4578735286.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vupapulijivexabo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/1c4d8fc07add6781ac153f886c4bd7f4/13111648868.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/10t44r53parjlelcvro2eea7ch/21394310565.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/wuxegumolapowolixijot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=when+marnie+was+there+english+voice+actorsPDF 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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 10824 bytes
SHA-256: 217d705eced1e407e8753683e718cecb54258b7381bf6ee003ad3872b5362993
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 18072 bytes
SHA-256: ad6cbebb4e728e48b87ad47ff582af8544428f5da68fdb16b8857561b3e8e406
font_02_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1