Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc172741fa1dc3a9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 17:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e9366ca556c5474078e4e9ca46f1be04 SHA-1: ff0e33c5404f946c83b66f3d6a95874c3ad86ecb SHA-256: dc172741fa1dc3a9a61fe950820f1862879103bb1290db30db655fbf737e268d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2ad8e0c51b0942dad0c9eb8d07a3dce3/sunezizemof.pdf In PDF document text
    • http://airsoft1.ro/files/file/zufigenupanibipuxibusidu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58bba4654---47653541445.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/56e24648557494a91c206e24eb722123/jatonelow.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6uq3ca63oj49jtjjksgv86sisq/zebidawebikarumo.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/timolutifabajegiwedudez.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/26749081634.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/rinolewexonojikobogebog.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160926ab5f28c3---tufinafejekamafur.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/57428641370.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/nopovevi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xidofavune.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/73436146102.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/silivexisopomiw.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/72629224738.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17dd222cb---5848625879.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/86689035777.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/pukifixebisetikiwelomax.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd18809a7---99805112759.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/wopazije.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610292dc209ae---rinepimewojareg.pdfIn PDF document text
    • http://hkacca.com/userfiles/sejapawabukakate.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/pojabugajujajuxawajugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gujarat+samachar+pdf+epaperPDF 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_off0000c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D3 16224 bytes
SHA-256: e14bebc0527ce1cd876278eb43782e6dc90f13eeff7912addb91833605a385a1
font_01_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10792 bytes
SHA-256: e0d50d585c89d5139118cbe72ac592c1aa8a9ee6111a1960ca93e65cd1824f7d