Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edd41301085b2ab…

MALICIOUS

PDF

82.9 KB Created: 2021-09-06 18:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f839b9506708c8abad05bc5cb8671e7 SHA-1: e75dd16ce25c5d04cc4c88d326654b157606d3e3 SHA-256: 4edd41301085b2ab33406c67705ed198d90d449022ab8d7c0e05b5e9e2c9d627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/139a1702e6bac6f3c33c63ddaff5cbf1/jajekoxat.pdf In PDF document text
    • http://lawrence-spruill.com/clients/42275/File/33695054709.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ec1fbb6d5a90277f0a7782331436ca2b/wifukizanafojabadulox.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/kujigujizizubusa.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/60969982055.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/donokikufe.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/lozaxonenokakowisup.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/15422764073.pdfIn PDF document text
    • https://datawire.gr/files/files/jorinamap.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97ea2521a9---zizumafetanuxuwidar.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45338da980185e07ee2b78c04944e78e/94687612298.pdfIn PDF document text
    • http://ustunongel.com/image/files/pabiji.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/tapomixeneduluru.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b750787c3a---23182031903.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/b1e2b50806fd8caadaaf44aa2dbb03c6/bosurisewepiferozerasad.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d8113abd1b46504c9f043ba9ff52b6e2/47243903379.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078417a49994---58326418038.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xufudujinerus.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/nozuva.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/af46ff50253f143f1df3ba28ba699441/zewudilej.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/11364251995.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/44370096503.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f80fe68cdf13d328be35b977d52aa865/3313924111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pediatric+surgery+pdf+downloadPDF 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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 11096 bytes
SHA-256: a878010a0ccd0592a5abaa9a3529d7994ccd60d65831817f5b1fa57a01ae87fe
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 16644 bytes
SHA-256: f3d2dd973653b47869e18a78451b3ab288201f8fc4866e0754fdbbade3a0c44b

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