Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d21ad25bac1eb7…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 09:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8046671404262226d14a3e0baf6cc25d SHA-1: 778ed29b604ede0c66b183f05a7718efd3d9c794 SHA-256: 50d21ad25bac1eb7748921372a009181486297c0bd20c27984dbe3a7b8be5997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links are likely used for SEO manipulation or to host phishing content, aiming to lure users to malicious 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 https://cructi.ru/uplcv?utm_term=producing+drum+beats+pdf PDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fahakuiksubk698b0s198rmau2/89391121810.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hidpqcbikped7dqimcdn2et2i7/4255455678.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/91863408588.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/59349763157.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/78506554892.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/vufamowig.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fajasodezijilubaxukexeb.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mt2md9esuibo9sbookqas0kn30/kozowozilanojedipiviwaxiz.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d4839cd117f4e36edd5d01f85b03edd9/23739803494.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081821f6d445---zagejowivixumubekijad.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/69549238294.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f04ecb18be3be415ebee5e4622e8b9ae/45601125839.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/rugelofutonedebux.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/34634095737.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160865a4913535---vagutuxunesetagapup.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/2501153245.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b8f90693---25025008967.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2c4a87df2dd49947cb919fbb350f9bf2/fuzutafijavejuwepawa.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210817054351.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/79640929903.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089dba611ed6---xaxerilipapebez.pdfIn PDF document text
    • https://penzion-palice.cz/content/77165199159.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wabak.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/rusopaxowa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a695645b89d---38477923297.pdfIn PDF document text
    • 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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 18112 bytes
SHA-256: 9816c73ddaee5b6f4c3e09488d86d458fcd1820031ccf19ef3fcceaee67efe20
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 11156 bytes
SHA-256: 2e3daacc4506c184413d29fdedcfca67b737a55fd53cbc0f0be30ff989dd77bf
font_02_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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