Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cfc627205404d3…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 12:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd8af160c4e9b12538e73f7c60bdb654 SHA-1: 50c823a5abff846507c686e9e77ce98b7033eddc SHA-256: 09cfc627205404d38e3c4effece7e12d986f372e2e5f1104ddbdcf942fe9ebb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fnb-concepts.com/images/uploads/files/nepedopobamidoz.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01eb135d9---zeribenodim.pdf
    • http://younewstoday.com/task/userimages/file/wukerepowamomaluted.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e7d9f7ba---vamutupifogidi.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff9adb9c8---zemudoxizubudovaf.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8a115d7bb---31410313312.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b42a6d51---kevesa.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794f3d1d0b3---53704944427.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tdjpm41jhmudia1qu25je2d353/lekix.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/55272854529.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb66004669---95578561843.pdf
    • https://topupdana.com/contents//files/vutanadidir.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707fc121d75---wudodizezesudapogesija.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f00b4b0b7b---33880040173.pdf
    • http://lycee-elm.org/userfiles/file/45416711558.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/727d20432aaa8ac5d7072f12efdae2b8/zisinawojekibebakasugu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607444d0b0613---99852015109.pdf
    • http://ats-dz.com/userfiles/file/puzasoxozukavufupidakuk.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776737c69f4---24891958022.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ln2ofg2vt98bpr6n85a5pl40g/24699775473.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662bddf1da---wuwugevit.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/43664700077.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806edd6cf38---kuzozavafimakovo.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/138927b587f2846ffecb402ecc7f1a1b/82975861930.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=4+letter+words+that+start+with+in
    • 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_off0000e7ea.bin
56bdb0b9cc31fc8547529e76fea074fe3f56ac5f1ec603918989b70a5955238a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 10412 bytes
font_01_sfnt_off0000ff80.bin
46b8664898c5d75c3b8920697c49186a0dfd5fdae34616a866f859c73319800d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 17376 bytes
font_02_sfnt_off00012d0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 16792 bytes

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