Malicious PDF — malware analysis report

Static analysis result for SHA-256 83914e6135027386…

MALICIOUS

PDF

109.4 KB Created: 2021-06-30 09:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 139a25102d2e94ca9d6ddfa07f6eb0da SHA-1: e11b673ce065fc37362c892d9ad0c9925fc6c5fd SHA-256: 83914e613502738652a05b0a45b59e3809c76c38dc7b61f9b9bfe49bc445da76
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple URLs hosted on compromised WordPress sites, specifically within plugin upload directories. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/41aaaa6799c987cd8a754052a0e6ae3e/wogunomijox.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3959d713f0---nidive.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f5de36a0c79f06137f5ca224e16e2a8/8532367643.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/79365188400.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079eeb87eca9---bodewazaxevojudino.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vo0ptsudbdvqjv3272emev0vb0/geluzibebogixakererus.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/fd04380815471e185d72ef892a99b947/xozudibatijobig.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/tedugitosix.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/645fe4774359014329ef0cda3cb7c50d/66187513709.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/28f0f8174e9bb9e02be1b0185c5de5c2/nogejujolorinazipuneke.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/eigdt74a5mhp2rl0l39s5c1q8o/figonigomono.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa74d9db6f---89665097540.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wivifumozepukunikoja.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3145d9a99f67a8b75fca9c1419b633c9/fukemotifumanevumuf.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e1e6d127---zunobodazisefufosimivi.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/45320673317.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/vugepulanoridowiwevedetar.pdfIn PDF document text
    • http://beiks.info/public/file/72476603125.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff91139a2c---bezevimakobetoposipuku.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b784b8e5f104af027d34f9bbf50ca1a3/68368903422.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbce31c471a---fofixikibowu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/2136515490.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1u3meap59cog0fo7oama641vh8/23233176805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=heart+touching+lines+for+my+lovePDF 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_off00014b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1F 16244 bytes
SHA-256: a0cf80a62a3bad2172602c2788fa19131aa60bdf3e4ff3efe8d06524b424a1a1
font_01_sfnt_off000174f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F0 11056 bytes
SHA-256: 46bb52a87ad2f98adde334c964e850030df95e1d67a52ad017d95a23359c041c
font_02_sfnt_off00018e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1