Malicious PDF — malware analysis report

Static analysis result for SHA-256 887f2adfd3760241…

MALICIOUS

PDF

86.7 KB Created: 2021-08-13 00:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc70a09460d7acd4d4712928e994cb6a SHA-1: 425c8aece15a657d4874e0a997938c7739034b56 SHA-256: 887f2adfd37602410ab7f0f1f6d7587fd3e799a339af4e3e5116edb29e470bd0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6dc98c934.pdf In PDF document text
    • http://criollo-cocoa.com/userfiles/file/liwufefaxit.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6495ee6fb---woluserovetopajabobize.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1194e8fa---87450275031.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/79806250861.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3aa8c752550f743f9d1eca6beee99c46/nirativilazajekumegodif.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ba703df39a6a07d2a99e36e1c84b66f5/migivisevolokakakuwa.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/bijokaporudedofotaxi.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/nlk278g43937o58o92i4cuvhcd/tubotufetolaz.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/ligurajebisenus.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/86248110673.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/04f18ede30d468d59675ba9d407e5414/riropejevixilatezop.pdfIn PDF document text
    • https://bloomeng.com/uploads/23284232485.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e8d59ccf---26137675081.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc32b9df4e---52928896992.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/84928855699.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/denesofutujewo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b75542232f4---luzijutizitesoludotekaku.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/zagagoweru.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/mixorawizelodilegowejo.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d526e70bb3---75716823291.pdfIn PDF document text
    • http://benetalent.com/upload/files/7841571768.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/934hhf4lvk5m5i2o8ss2cf2sgs/bibikalix.pdfIn PDF document text
    • http://cdmsig1.com/ckfinder/userfiles/files/gomimut.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/66311625406.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/44e9af9999ad608548d6f27989a03518/63329781829.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/27009914927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sairat+marathi+movie+full+mp3+song+free+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_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 11444 bytes
SHA-256: 2316a7912587cd31110d5c85dcdc5e96dd9dd20a07caad1d605106887a0050f7
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16928 bytes
SHA-256: bc53f69af3ada6ea9c8b63499624a6519dd402149b654c0a99b6b43412d7a0eb

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