Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8017e7c5c7507c…

MALICIOUS

PDF

73.6 KB Created: 2021-10-01 04:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59121beaed7399a5d3a5e8148bef404c SHA-1: 3c8b8499bc38a4bb64b5311a82dccfd4b2a24e39 SHA-256: fb8017e7c5c7507c9be6f9f3424d4f7b340c0a5512a3683789fad55e9632e8cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. Multiple heuristics indicate the PDF contains a link farm pointing to potentially compromised WordPress sites and a raw IP address, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware delivery attempt, likely involving a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5b1ac9f7ec3abb6864c2f4b4ace5ac54/77940767059.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312d6e9d2c7---29526172524.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/95509304186.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/10760917042.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/soguzenupidanunojem.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/37812286641.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613634f03f80e---mozasibekolopejokakilelu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148130f8c1cd---10774511961.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/32757877143.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vk4u17g0a2mi2pu84u99igl0q0/lovoloxafoxunelesatug.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/28846785486.pdfPDF link annotation
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dc58cb3203bb05aeb63efbbfa346317d/2705813419.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/bupofulivarodufudi.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/bisukaxudorawepenuwedulu.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/tunatidirapekef.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/99911533384.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/busapewuz.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/panekatokedagozujodu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/kerosonibipabedor.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/xesejufuw.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/9167718523.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/86696445266.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///67741747407.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/vutuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=play+store+free+games+downloadPDF 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_off0000bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB66 17400 bytes
SHA-256: b8144133a44c0c406c30bcaeb090b5015e09c352ebef5bd659a9ebaed85258d9
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 10804 bytes
SHA-256: bed70f62b7cabd34686fa72f6644a0f0f60d68d2971e35f5f5a6cd1a0a3c0727

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