Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8802a24af650da…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 18:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9675863792cd0486d1797ad0bd848786 SHA-1: 15f2145052a4545fe7cde88202bb3b904b0d48bc SHA-256: fd8802a24af650da8abfa54b3fb43138bc01b8eb0ac423dbd7865fc1a8c2df6a
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 are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of a link farm on disposable hosting and links within compromised CMS uploads further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://ceylanotel.com/firma/files/zafuxi.pdf In PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/kodusaralu.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/lerefuse.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/53348661499.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb25292710---75901878716.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/11965415371.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/68200400728.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_99B7CAC3BA8C41C0.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c6ec5c73---rewufafokenonopukej.pdfIn PDF document text
    • http://schokofontaenen.de/idata/rodigun.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/17356963833.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/bumoviwosubagexoxar.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/futuvekavosero.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/seloxokixazejimasoxezolo.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210911223542.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/ledud.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/taponumukotagu.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/jafeso.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/37063940816.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450f33e54f0---ramekatobe.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/dopaduzuzitekadudiwujite.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gakugavaguzitizus.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/bazemazekuwiwe.pdfIn PDF document text
    • http://z500.si/files/995172730.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/80588415129.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/89184190386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=top+10+porn+android+gamesPDF 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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 17172 bytes
SHA-256: 758f6ad14821254c22860b08d4ea61b93243acc4f685fd2680990174bf277df0
font_02_sfnt_off000133ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EE 10728 bytes
SHA-256: 3660e6090b6f5a32531f7d7ab60cd29f54f5199e688c64dac432aeed774cf8ad