Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58f734f95482270…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 16:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f039f9af3b0fe7951777dc1f251dc493 SHA-1: 47ded7fcf1ef366353032ce880ca1529893e85ac SHA-256: b58f734f954822702382f23976e203f3352243fe0e650ed2f376341c116ae6be
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, despite some being marked benign, are part of a broader pattern of redirecting users to external content, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://semanbio.com/upload/files/givekegasosuladi.pdf In PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/kejafaxetikemo.pdfIn PDF document text
    • https://badrivishal.com/media/befavab.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/587f6126f2fac4ba38baa400c4108558/54377874679.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/magubaroguzotejamibiter.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/tamode.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c06e9dd8b---6262089526.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdca9934f6---lubowok.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/lujugepadepononasojuxik.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/puwazifepomimibogibadit.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/1446212923.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/xusedukokivawazesunefip.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/11100623399.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-10/20210910104514308019.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/pofuwotiluwomakalinisuwup.pdfIn PDF document text
    • http://waypl.pl/upload/File/89189120056.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/8372651886.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/87348889945.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/73505157122.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/16557063377.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/20675706519.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3840a3e2b8bc96cd331e8cc3cff1d9cc/73534957646.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/bidomuranevom.pdfIn PDF document text
    • https://securitydm.net/slicice/file/soleluxomanewobuwosowifad.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161421aded4a7e---19783209140.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614a36349bcb4---83620305480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+do+a+screenshot+on+a+galaxy+s9PDF 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_off0000b4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 11120 bytes
SHA-256: fff83166d744d60fbdd8e4d6650d245d55346c84d43c8af9e4b92d39774ce509
font_02_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 16868 bytes
SHA-256: a46fa545a876617975e1e224f644a3dde464b80a60036496cdf6677334ab98fd