Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac59b599b4705c6b…

MALICIOUS

PDF

95.6 KB Created: 2021-09-02 21:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6722c0e84544d812433434d21b97a416 SHA-1: c58f51932fa7839931e3a7d130a03d1f83f4061b SHA-256: ac59b599b4705c6b6924382b38fa09da85f890d1527628532f688def3953cd4c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many hosted on disposable or potentially compromised domains, suggesting an attempt to lure users to malicious sites. The presence of a link farm on compromised CMS upload storage further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://hijaulumut.com/contents/files/10445366271.pdf In PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/10644977112.pdfIn PDF document text
    • https://go2germany.ru/files/file/mexotovurosevevom.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/boganojoguv.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zagogowilafa.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108151906044188.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/xipoperezosegasobowame.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d6e78b6c87---zapadiniralilekobi.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/lumatalex.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/veparegefuraniru.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9758b70f---98163344656.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/24811364219.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb20d41009---nijav.pdfIn PDF document text
    • http://gespk.com/userfiles/file/tuxoneduzazinavojobugim.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/84993424019.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/73871666698.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/molimagagazo.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/64200742552.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///kutovebip.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/87007497976.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/80794088891.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812d0a14a11---nonevas.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/69d889fd1658e164cf937a09918c634c/mijigumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reported+speech+pdf+advancedPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 18648 bytes
SHA-256: ff0175581e46c89b84cab52747ef832a6d4b576ba65ada6eba90ba404a1fe983
font_01_sfnt_off0001409a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 10692 bytes
SHA-256: 97657d5b1bb04e15f4c146e269fdac1c7e2fbed52c5ac2a60e40086f4be8c58d
font_02_sfnt_off00015922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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