Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38fff3fc7518b9c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 00:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b321c397d495dda4d1da1635f653425d SHA-1: ecb7a1c8aded2048c7247df49e9f3d226fb6e170 SHA-256: c38fff3fc7518b9cd524d3fbb8acefbef49e8e2e1021614d8de8901a2007ba7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cpghollywood.com/userfiles/files/48173278118.pdf In PDF document text
    • http://airmon.hu/images/files/16052833332.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/19t94qf06n115ofvo356bfj7qc/24496733237.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a69c61b866139bb8e9035f53bfa589f1/pamile.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/wuferupujipaxojibamipik.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/zezojakutupukad.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121785a192e3---gedizubojawevugikip.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/fajofoxagivebedivasesenug.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/59559938967.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/41363593977.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/fesebexixenanepafupezag.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hr4293ips4adnp7jq40g8t1h55/benojisorijafawasevoge.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/tapufuzubadesa.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/vupasaso.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/banoruwukipefezif.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4mankigre7fqk358np44n50ma0/gebel.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/c5q523bef7ue8730si6ehkh2sn/80295595284.pdfIn PDF document text
    • https://ysh.my/userfiles/file/77424268378.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/93674872052.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7cba511a2c0408dd0fe9aa4022528ea/gaxedutukupifa.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sioqkpjccj2fus8k6msm707vv9/denakiwebuvarav.pdfIn PDF document text
    • http://learningkey.org/userfiles/86393368922.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/fixezadutexakabidokapefu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/sosogumoke.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-04/images/files/kalimifuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cons%C3%A9quences+du+r%C3%A9chauffement+climatique+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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 11316 bytes
SHA-256: a27ba3daa8560dd4fde3d9863aa9da27c918e2d2dba8fb6a15b2de9011e2740a
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 18816 bytes
SHA-256: 99a70b18e83f96a0771c9ef393d70a24597828658c92190f66378d9cfcf812f7
font_02_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1