Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdefa55f61f5532f…

MALICIOUS

PDF

82.5 KB Created: 2021-08-13 13:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac7da95fae207bc978fb01556f4f90cf SHA-1: bde918916f26f9674575520023d71315a1347e83 SHA-256: bdefa55f61f5532f8d65555b538799a66869196fb2e39ea51ecec24079d2526e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised content management systems or disposable domains. The primary goal appears to be directing users to potentially harmful external sites.

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://geredekombiservisi.com/userfiles/file/vebovipisofekoxi.pdf In PDF document text
    • https://istanajp2.com/contents//files/redafopetizubomusutuneve.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kojixafoneleditametaluj.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/56746192135.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/78e384b77ef61daeb1649758beb78b24/gefopegigalunexiritu.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/20710013139.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2c1518ba788ba3844639e9a54a26b466/fopetawewunelegilag.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/64880819628.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/sovemivogik.pdfIn PDF document text
    • http://mid-europe-ex.com/84643728929.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/befej.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1de1d185---81078842977.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/18648374670.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a70eb2cb966---zajexive.pdfIn PDF document text
    • http://cocoal.com/uploads/file/bofeserofukugote.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/senafubategilomu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6ec2d401dee1528ddb0f625867d3be03/33016288431.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/37986265066.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210619222120409085242.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-21/20210621105157731763.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160829a7e40ee8---karimu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/89622871589.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2ht7jcmmduajdl2sdsvtd62r07/fofunujufaxokixitoketa.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/jegakisetuker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=faceapp+pro+version+apk+free+download+link+v2.0.730PDF 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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16628 bytes
SHA-256: 6bc172490f1d43e132ee8df89e81d18d236207dc535666f7f5a5c8ed7f65ad3a
font_02_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 11264 bytes
SHA-256: 2789fd705967da39106abf94140b619e06129fc43dcf2a20c18bd584a2fe58d5