Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d52d3f7a06bab94…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 16:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a5afc696e357d8d45f87a839d874919 SHA-1: 414634c75fd309209c7092ff9678507535a100c2 SHA-256: 6d52d3f7a06bab94da257bf8003721e45522a1fec3d57ac130080e6e776aa86c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings clearly identify its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3388eba36---47226386024.pdf In PDF document text
    • http://marinda.ru/pics/images/file/15962251591.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/fujutiliponena.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/ramiso.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/bujar.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/bemozolujidoxemodoxef.pdfIn PDF document text
    • http://apismorava.eu/docs/52442838985.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/kaseniferixej.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a53a9c90---lerilowogodikowubewepotuf.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rupeturodowevudop.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/58678540708.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0f09d52c7c258731760ea163a54a05c5/dotujulajita.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/fogefiserudaf.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/33234020209.pdfIn PDF document text
    • http://remobudostol.pl/pliki/nodedodezoronululudeti.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/49946146717.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tozanu.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/47045494758.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/bivid.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/33015953258.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/868c44462bb0492809aae129c52e59f6/tewovoxubadaguwa.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/35014617533.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/58632829604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pubg+mobile+lite+download+sitePDF 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_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 10816 bytes
SHA-256: f3f98161db1fcdf34abc70f96d92de3a28d7042aa834423ead5cfd270b516573
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 18256 bytes
SHA-256: ad35f34534cb63abed51bdbd334c969894ac5b55f99696a020a9c7202543cf93
font_02_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1