Malicious PDF — malware analysis report

Static analysis result for SHA-256 713b06cac03f3226…

MALICIOUS

PDF

85.3 KB Created: 2021-09-02 17:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a78b98650ccbe6f919392a988982e57a SHA-1: 12997eece58c8b94df0dee2eb3cb465d6735a75c SHA-256: 713b06cac03f32261679fd63e349fe82a4874bdd6fe2279687c8acfa7d11cd69
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://thegroverestaurantnj.com/userfiles/files/ximolokapivodejowazivo.pdf In PDF document text
    • https://hexema.com/FCKeditor/file/gitolubojedu.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nodixipufufan.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec24019db---ziniwizuvexigunebivujoze.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce12176e9---zofonafigisesutazexamajop.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a9eb126b.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8066e9521d7decd1c0dddbfde19afac3/zivaxujiwi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e85a54c18109ba055034fa50f9dccad3/fimiroxowivimiw.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/16855014940.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/f4f6sfrlhl86ht994qh2981dii/jidinavuperakezej.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710b84ed207---dagigusafejixexikulaxure.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/8138529478.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/11310264533.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a6824d50de4776519c5d67f8b0777da9/83846568095.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608835e005924---89375034625.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/7104691001.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/822488ce515b4cfb88e8b89d841ebc08/pojunene.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202108231513236112.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jjeovu0cpct0kgjbhn6tivpsms/bixavapuxepemojuvonimuz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f07f2eef076---6514038452.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/32969511926.pdfIn PDF document text
    • http://lagrupacio.cat/file/wuledupugadel.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/6211727379.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e656ba713a---14457758743.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adac41c9ba1---zijarebuvez.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/45633587427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=practice+worksheets+on+transitive+and+intransitive+verbsPDF 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_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10808 bytes
SHA-256: 8300c5353836052c84e3f8ba9ae3b53747c78082576d29938e3467c2acbbcef4
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 18300 bytes
SHA-256: 8e1815a1cc619276334b9fc895220870a2be9d4c0b04d0abaa72a545854caf6c