Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fcca5c5038fe2b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 12:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a0ec6db741aac978a0147e18a6e04a6 SHA-1: 6ad717a272a6c0fd62b9ed5a6f6c4b0b892876c7 SHA-256: 78fcca5c5038fe2b6ddec10f6c6a9d17fbaeba184635a519e06a487ea81b5d36
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised WordPress sites or appear to be disposable. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fruitsad.pl/images/file/bewitarimilekub.pdf In PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/vukifi.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/vefusafagakibo.pdfIn PDF document text
    • http://sungder.com/upload/vomisigufupogabix.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/92918950494.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zeraxorufefunixude.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/xovagakituzajofifudog.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/913571a2f2aceeddd6894e7a34697ce0/rotedetatikuxiwivari.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/16076105969.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/50539304191.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/lobatoz.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/90170333211.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/78665510262.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/nupomukunixivapaluwisuj.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/66227995721.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3a888ea0---1501358617.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kajijuvirawugajaligune.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/jabenenutum.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/kisalijikozipoxijoxo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a300fc246d2b7c29e5fb845b58ac99ec/72155415984.pdfIn PDF document text
    • http://ametansk.ru/uploads2/wamozomom.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/ladofira.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0ac3fb84---metiwusifofutabasimamodof.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f980f53dc0---7876163495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=freeflix+live+tvPDF 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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 17588 bytes
SHA-256: 133fc4ba96a71bb5f7fd4c4beb9b77d69f3595373eba73674d3164a632f797a1
font_01_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 9796 bytes
SHA-256: d5fe920ecfd41fe06f0418cde7a74d100a31e4362f56cb5655538ebd726b9960
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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