Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cfee30a4e624dc…

MALICIOUS

PDF

97.6 KB Created: 2021-06-28 04:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 896228d249f9bd32b7c7aa526f579deb SHA-1: f93815effec607968fdda7d29eb739f8e725827a SHA-256: 22cfee30a4e624dce3a5e6bdd427c017822ea5b118a55e780799043bb0d31cb1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to the download of further malicious content, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/592ba009f88fcb2cd290f917b951e00e/julawog.pdf
    • http://nktrading.qa/file/files/98645541802.pdf
    • https://alteanetworks.fr/img/file/20605522165.pdf
    • http://bjjiffy.com/upload/79180671391.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2db9e71d4---32566349333.pdf
    • http://alexlunacoach.com/img/editor/file/14693002635.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e77b6b93b---gezekanisonifaluxal.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rabfcv3ljgpe778bn3bv7m5vve/fifovuwipodew.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/se1i0qasd1uuka26vuj5no3t4b/jasivebirepibabibom.pdf
    • http://shopexpert.com/app/webroot/files/userfiles/files/78433673870.pdf
    • https://topclassgreenery.nl/images/file/vezajuxo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52164c77da---76993192049.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe00ef9bb---mawikitefawivave.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/j7trerjlmoqjfjfdl1l4qoc6os/rewejurade.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737bdab9edf---61298400839.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/1212910468.pdf
    • https://ferdavagnar.is/images/fck/file/9511028537.pdf
    • https://666666.vn/upload/fck/file/waxemupivutabinolupo.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/45f87bec98b4156344ea10ecf6b7d244/jutipodimide.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cb92e5b2a418b1083342e1eeb9d77e9e/11120472837.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/77460026239.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11f206d06---bugisujowu.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6ecdb336---wijatosedadepogawewobet.pdf
    • http://flomojapan.com/upload/files/45883280245.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607849ad3dd34---8992112913.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb0ad72d1---12229517549.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+capacitance+of+a+cylindrical+capacitor+can+be+increased+by
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118db.bin
45a7047c2dba5cffc40c0b5d509a16964cfaf8dd01f9eb5634812d5355ce4c61
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 17520 bytes
font_01_sfnt_off000146eb.bin
3ee7f4fb9cd9b8d70ab104052ce1b67187ed1697bb634a36cdc3023f1853423c
pdf-font-stream PDF embedded font (sfnt) at offset 0x146EB 10932 bytes
font_02_sfnt_off00016002.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16002 16792 bytes