Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fec557261c24ec…

MALICIOUS

PDF

104.0 KB Created: 2021-07-13 18:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 356628db0c400a7000e86264f59d0020 SHA-1: 205949a0557e7f36a3362dde055b6cd304464b50 SHA-256: 78fec557261c24ecae1324ab987cc02a003d43e80563c22eb0d479d1c1d06d20
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://anhuifan.com/upload_fck/file/2021-5-30/20210530012439230208.pdf In PDF document text
    • http://funperm.ru/content/file/58372443209.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/231adae4f6ae5d5e4e4d85f7ab72a22a/xezafegojefitoxol.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945d2709398---jivodilu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d75185b8---gitadolagu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddddbd4fdf---87288171336.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/98170986132.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/86399732388.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/49418803934.pdfIn PDF document text
    • https://masihpt1.com/contents//files/tolifuweluw.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/vafilolifadisiti.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/bapokokovi.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/rojafesesuwepenile.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5fdbf566b4cd3fe3ba2e1bbb63bad496/mozowiratikokinaretupikak.pdfIn PDF document text
    • https://orrizon.ru/images/file/61866972273.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608dad9308b03---72726397604.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c43e6c3e---5468885552.pdfIn PDF document text
    • http://flgr.ru/files/files/96980926309.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/goxonimajag.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce71ee5c3---durigifobojimemam.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a568aa478b2---tigefimupelet.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kenanufuvaneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=astound+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012cce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CCE 18532 bytes
SHA-256: 58dc172e34e0ab44a29c884c2cd7fa803d44f29c6491a0e600884adfba3e96da
font_00_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 10572 bytes
SHA-256: 4f92589e1c3882375ca247477182cdfe3d2ed5ef3584e9eacc239fe3a4697172
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 4600 bytes
SHA-256: a7547a4da0805cfcb6a674e446fa494ee57df3c37fd10c03adebb5b2322ee3c6
font_04_sfnt_off00014b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B17 27808 bytes
SHA-256: 4185eebdb9d701b5a2fedced7886e066ce937e2623831eeec6695830c2fc13bd