Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fac5ef33ad32fd9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 14:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2810adb87b40de54ee847c49d3f47d0c SHA-1: 26978c0e34c2f74db1325b0691c40eb852ac6d5c SHA-256: 1fac5ef33ad32fd96f9a13ff928a602e5dc6af6ee8d0eba68758478796f22a9b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users into clicking them, potentially leading to further malicious content or phishing attempts. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f1a4cb727---46180473998.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6a48b5b4c993481c1da25ab755fc3691/52560217488.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/ligilunoguzukasikivoman.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca7b0a003---79137020376.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1625539772487258568.pdfIn PDF document text
    • http://juentai.com/userfiles/files/63853011150.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95335b691d---8799927232.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60932e33b7---52362976610.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/93jvq98tv59memidc59g6vkaec/97080448973.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdb677c33---23972537464.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/putesofitetorixumowoxif.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/lumilonupavuwu.pdfIn PDF document text
    • http://risme.vn/files/jaxezitine.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a56a78e94---72771501264.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/161092aa1406c4---8422425812.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/81273138762.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/23403249943.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8b3e603e---10096352777.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c822ea99bd---fosezej.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/buvireduwebadunu.pdfIn PDF document text
    • http://patroha.hu/file/fowarozeba.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f0b0a32---61277621072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=present+simple+questions+game+pdfPDF 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_off0000bcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC7 15752 bytes
SHA-256: 09767edf0202d18365cea04da6084498667bcee2bbcf91d1f26be813e37f979f
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 11088 bytes
SHA-256: 6d35751192715e72339205c6fe031343472a34812df57744fa3c9109c719fed0

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