Malicious PDF — malware analysis report

Static analysis result for SHA-256 2210f219e421926c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 14:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f58da0b182719472901f4e8779ae0258 SHA-1: 040ba497f59349b2111c476d78d3097ad8724beb SHA-256: 2210f219e421926c57d4fd4c5baa1b20eee0efc570e80774e5a69c5c7514d01e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads. The PDF contains numerous external URIs, many of which are hosted on potentially compromised websites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to host and distribute links to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tjcp0cef9fdtsq03msf4tl0ih3/vepoz.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160868207b690d---pevufetabinosolokol.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4692c3767---88785511868.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/73729425365.pdfIn PDF document text
    • https://computerzone.pk/file/76610676622.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/joraposijavaxaniti.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/61157373226.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dowazopugerazis.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746407e7313---boduletuxemexukofonewuze.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928fc0c7fa3---lisedavafezobadenupef.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c79936e03---sejagaxuvigutevevu.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xabagudegubolavasitiw.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/moxijikujunato.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210811034712.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/505a491ju78fgd7bu02327h7pu/78201553515.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/45023438765.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/vosofifikekejekom.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/wejogamadasukebalijape.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0568kj0k41noch10651c6b71n3/50408363925.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/33585429061.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/15353614910.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/43898203256.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/aogul32fs218oo2t6ofv66kjpm/95181033165.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e750273a56fd31974a24a8353fabff4e/jowojavapiximame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=othello+tragic+hero+worksheetPDF 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 17468 bytes
SHA-256: 78e97183bd1df59cf22f4a2bc7c579da00394b0d601265852760701596bfec9a
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10608 bytes
SHA-256: 873612724a06a542eb38fd690fd65e61b6c2397ed00a8f04e7989134372d0c0c