Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c116c001dc6c30f…

MALICIOUS

PDF

86.4 KB Created: 2021-08-12 15:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 705c5789c3c44b3b1530470d6552f480 SHA-1: 588529c13b37c7dd30dddd50667991e433f1f352 SHA-256: 4c116c001dc6c30f17bf63602de31897b4c19d2d890c4d91a52a8a36bf3c3db7
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. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. This suggests an intent to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://begili.com/uploads/image/files/lamejiwuni.pdf In PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/3d6d586d1d3544932b78db7b843aa729/wipupunijujupenepigosaruj.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/94f6b2dd673fe442b5f9e83d4e8e17fe/worapeliginokitaregap.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/44552402993.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5610363938.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/25q565cdu069glo8entfe3971b/piruwabitipiliwowefimav.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ohi5t5u0c6shs6da57a5dm7sof/peguzudosusesojidowetam.pdfIn PDF document text
    • http://amandamaitland.com/images/file/zozij.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/10824573852.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/39573459974.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4bd3340afc095895f3b07888dc64c0c4/96573248.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/67719886438.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/79dir7prkhp6mvsf539pe98sj2/59130016688.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c01376717---6840482575.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ea2901bd6122fa80d41ae118a24779bb/lakipakukasusejufun.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/35282780182.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c2b165b1---30852164706.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/89478623869.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qn705e8i69c3j5rg48fjdc4o6p/kuboxesulo.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/teliperupexanab.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be74ba01831---reboperudumidavixuton.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/11170555566.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077020e637e3---tuwoxisesatepadomas.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/th91lmtp4pd151s8qk7iujdp36/75723834.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/iuqju8f1rrupju2r7gdd6fcfk2/66663209802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=will+there+be+a+the+maze+runner+4PDF 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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 17760 bytes
SHA-256: f67d35749de724ffb6d204da8d843612946b1fc3ddd725f2ec3524d30a26cd68
font_02_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 10456 bytes
SHA-256: 6935b76906e729f66a6260eaeb4ef92ec5e194307b14ade6c4ca9a4690dda541