Malicious PDF — malware analysis report

Static analysis result for SHA-256 afac40677758ea4d…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 13:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c3781762d5588bef2653cdff0d6db794 SHA-1: c249c5f9b1fe093492914bf6c39e0da23f9697b6 SHA-256: afac40677758ea4d9710140bf851c679ee6761deba7b4063bbff2185857a23c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=free+synastry+chart+with+asteroids PDF link annotation
    • https://daismene.it/file/55984443308.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/64732401025.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/roluxaxelu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc43156854---bovevibigikenuremegexigu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1d48a32e---pasexubexowovutese.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/75907564679.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/baxinutupapofopixamovaw.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/tatodupaxupame.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aefc71ae844---41466528897.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/79452585248.pdfIn PDF document text
    • http://belst.by/upload/file/24258699317.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ffdb42c4a516236ebab552c8cf0b32a/79510662080.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/wixubuxesesekagusule.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/523325e0627f0c908f493e48ea809731/81369894782.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160859a83a2b01---zasulenesodirupeje.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce32962c826---rozowumezudupuweguw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1b9a74495e862ddff40a6f31bc914c74/jivaketazan.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c12e8b82---54514452926.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/momovabuzukiv.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/sixotob.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbc9170c86---36080527480.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099acb71d4aa---84745075480.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1ee476efd379d8889f46163cc2d7a448/bowomelupafineje.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/a352a193e296be9578e021b1cbce7387/51857723812.pdfIn PDF document text
    • 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_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 16520 bytes
SHA-256: 3a1eb105a85bb5b454589fcaa5ec1fdb97e353f9599c9ad8d460ce36429f713a
font_02_sfnt_off0001438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 10600 bytes
SHA-256: e13ecdf6106dad7a2541fb66ee93bdfb7db201a12fac28104e41fd09dde2024a

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