Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8fbc2142f98e99…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 13:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d287adfea3b1cc38f69f60583105b63b SHA-1: 50d4c5f2f245bf2451938e9f7682aa5f21700f26 SHA-256: 4c8fbc2142f98e99b214dfd893db1e64684d6e4784f266ff2fe54412f7f1fba1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://perilatomsk.ru/ckfinder/userfiles/files/nowodeneboruzulo.pdf In PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/92632593153.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc94f52dc9---82591031552.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/vevomalisevokorasixagup.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a4a936612d3fdd9d61c73879dd904976/7765594718.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/79207840600.pdfIn PDF document text
    • https://panama4d.com/contents//files/20421562290.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gufadubeteseta.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xajijotuzirulebesagimama.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mepozabiveledobu.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/redunonanirufomokedinud.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/degigutuwekunosezup.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/47a24c94d2af00d319ac6c8752e23c39/wogepomesin.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723efba20fe---vagub.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9994baa25491a2aa4a980ca2cb307791/31289110524.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ccec26ead---benanemisanani.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/859046eb99cfdf0fbde0675472541176/83483267144.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/81431246353.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/7418944420.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e019b3ac45---42371403404.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b76da6707---98114877088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+most+frequently+asked+questions+in+an+interview+with+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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 16596 bytes
SHA-256: 4a89104c29a1f4b7c446201dfe61dea043662d564858659e3ecc1a7a2f9d9a35
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 11188 bytes
SHA-256: 40dced2c2bd1c9740574bb3684bf8ffc20d6877b7057ca7c031690b6ce9e77b4

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