Malicious PDF — malware analysis report

Static analysis result for SHA-256 668f58ec0de6c2d7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 23:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57c62527e61e0232bea7c0cbb0f115d7 SHA-1: d8a7588926c0e46bf3c9794a736bc2ba342c1a9d SHA-256: 668f58ec0de6c2d7a80a300f9fbb72ef2184d3c327cb7d5a66e2cfae1c4b1286
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hurtglass.pl/upload/file/86066582987.pdf In PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/tidez.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210720013548.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/girefosoluvawotubekulafas.pdfIn PDF document text
    • http://apcmagon.com/userfiles/69561983719.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ea8759c3db115790fa144a75e5733845/sazepaxut.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75b23bcca---bofisojizig.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcc687aeb---94364770026.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c8868c8b3f217494a3c342438c578488/27440508912.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/29958590716.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/63997128526.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/malugufopivinozuvagagozom.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/19695635589.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a69055186---39620030873.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wibozazekorarikowuwakadu.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/65748346556.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4701984a5ceadc088df2f04bd6e65990/18777680920.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/febelusuj.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/24051642366.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3f51f50ed224bacdc782960bf3db546c/5619138456.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/58216969274.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607248e00b5e5---tagasinuwiburazuwurikoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mouse+party+answersPDF 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_off0000c4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B8 10400 bytes
SHA-256: 891a0686eb7dc5c48c16be0b3ec3fae7110924acf7c64ed3adbbe3a2c9e5cfbe
font_01_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16632 bytes
SHA-256: f26eda56e206327d5dc0d219a5dbc0cf58c160aaf71e6981897beb12617be65e
font_02_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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