Malicious PDF — malware analysis report

Static analysis result for SHA-256 772227c658ff27f2…

MALICIOUS

PDF

92.7 KB Created: 2021-06-11 17:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 60a57663a44110a2e0a6ae03df49f3a0 SHA-1: 34181c4e65f8cc3ea239b8d91d351fd4232da843 SHA-256: 772227c658ff27f294404b70e95356f4c4318a4379688b9564eeca47a70a155d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=soda+saga+mod+apk PDF link annotation
    • https://pharma-tools.eu/galeria/file/7039799873.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f59624717d---mekexamuxilu.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/71404532695.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a6138f8f66fe16cfca4b1ca5f60a69f2/kuvenexuxegazeti.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b3601a8f26973296dc29c30b94e30383/83568263149.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b21b408b---zekexarugusu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8d7627285b294c8bea4d13faf8c5ff1/98418982631.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609870234849e---39964939162.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe340d1205---venegobitov.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/08069582830c8fa2790f6c4efeefdc32/73106641702.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/96770566627.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9be968a20---7475348939.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/0bb7c80ae992a6f7e6313a4856933da9/36100054774.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-10/20210610013002614242.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec20d5789---31951646449.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/24e8ef275808070ac3c4b2c995a23ef3/tiwefujiraniduwupojim.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/xogegiwulub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 19948 bytes
SHA-256: 2816e4460b76a71de8f567587d87164ada0768da5791014622de08751e8ff248
font_01_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 5316 bytes
SHA-256: 299258210a0812b87b90f9b16243f873c984fc78464710aba4205271ab5d52bc
font_02_sfnt_off00014098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14098 10804 bytes
SHA-256: 7aa9112bda70e1830558a9c0a9d57e4dd0ade80219489fe78c42e1347fa43ca7

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