Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f760936dac37d9…

MALICIOUS

PDF

84.8 KB Created: 2021-07-07 23:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b88a36dc923bce32c1a92c14b23c675a SHA-1: fb8fcaf50abe684357c94b61fcad65cc29675af9 SHA-256: 48f760936dac37d959f8f8b0cc060899d212e4ee5142170c1fffe971cab9beea
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the presence of numerous embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ac95ca9c2ecfd21664495033ac6b0e0e/dinemigofopuwazalenime.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/dorabofajusunepugowaxekov.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/28c858d5aa4f86b2cd2415ff65e9324c/73247170410.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/vibafufeteneru.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/h6suifumj3neg45fav8a8sbnl4/gibazanodato.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bc242db4617---71189578178.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8829f76635---seluwelitutifutelevevafar.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/rajumavozuromi.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/63395189967.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/41895449593.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/buwujexa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a168c45d3eb---18735529463.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092690ae9508---38503651066.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/7dlqg94bmep4439bekms950n52/vikobirasirasamowajunibe.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfadce540fb---kadipodaronifab.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/1539349901.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u5tbeo5604ori8hdvrj1pub9ep/zurovapolowotixupojita.pdfIn PDF document text
    • http://elskenecologie.nl/files/nigalisu.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/s0sdo6lin20rjusbigkb95htd0/kenixavepogebodorupawi.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/mixenesalomome.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/10269390127.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/78721134265.pdfIn PDF document text
    • https://securitydm.com/slicice/file/sunibajedazigegol.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/majod.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/titolefutunemab.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/301342522.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae259ba707---darafudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=delete+blank+pagePDF 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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 10180 bytes
SHA-256: 008ee90ed5e6ef48584b9aa08f66bfc9c381e4dc08f32239b7e183f0fc3089b0
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 17000 bytes
SHA-256: dceac701b53249bba4f1d342cde03fa1ccf70067092d4ddc9d6fdfde84de22a1