Malicious PDF — malware analysis report

Static analysis result for SHA-256 205130f6e879e005…

MALICIOUS

PDF

77.6 KB Created: 2021-07-23 14:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8946dbf3db427790d4c9f2cf1267a9d7 SHA-1: 5ccf4df6822212b3152ef7807d77f7647ff434ec SHA-256: 205130f6e879e0055da85a9922971e4e33eb18e8ef316b618eb4f819c9bfc99d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload directories. The PDF document body is heavily obfuscated and contains no readable content, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://sewakendragroup.com/userfiles/file/vitosiwususuxazesikuw.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/a3ts93ntr0712tgtt5108aam35/10538749105.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e555b6f3---52037557458.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b40bd26c20c85d1a7d5c5ecebd59c1cd/folalojulavup.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ce6ae1de225f884a998c13dd68006af2/3229281804.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/xewoseno.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/tinifatebuluguta.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/97037168018.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608133548ad29---92333828617.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/ic16vlfv62noejj8b0e2tv2d24/wawajawobeniruwegarebiper.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e220cf0071b---dojasipivagodexefog.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/guwukamomabidofupo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5o343f200jo3rb3rjuhjfr3i11/4233499056.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qbb1ma1hvu1vge4sv0n0s3om09/46267753478.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607571777b848---16597017914.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7796def976b4ee3685e797cabc46766f/12590746029.pdfIn PDF document text
    • http://dges.in/userfiles/file/1589294863.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/samenirowipovutijexobiw.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/litodofamirebu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c52dff170a2---2967918458.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04bc90331053e102143e33fc1d957ee2/37669465010.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kbroi37f6m4ct08gr48ta44nt6/lusazusibufuridivolumuxuj.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nomirizemiwowipelufat.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775bde34f4e---xumorufegur.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/34423903894.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/rivunukaligoluroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kpss+geli%C5%9Fim+psikolojisi+sorular+ve+cevaplar%C4%B1+pdfPDF 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_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 16820 bytes
SHA-256: 6f803a800dcc6e02c73ea3d73352c9b096327169db761ad409365aaf5f4cd57b
font_02_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 11428 bytes
SHA-256: 7fb71046e12eef1258c4604776cecad56fd0e27318cdd7931f069fee4e802394