Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d6dd7d14453026…

MALICIOUS

PDF

108.9 KB Created: 2021-07-15 23:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a75c55e19ca7796564261849a2b574b SHA-1: ae3c15fe05f9a55176af657dad300b4477fdebfa SHA-256: 37d6dd7d14453026ed728c4300bc01a8a8ed0d1f4c84f74c85e52e0bed6a9c19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://allytemp.ru/uplcv?utm_term=livable+city+meaning PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/85e91dc6e3b817606eb6265bd969dd2e/dogesudiwux.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd0f0b08c---koxitisezoxazar.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xinelikisolelobagize.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/javuzaduxinizisizos.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f9cf4f2956f87778447dd0bedfdb830d/tevomadexofo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9diqi4rj010taa397gob5s1hi2/wukowo.pdfIn PDF document text
    • http://ty-int.com/files/files/71390912361.pdfIn PDF document text
    • http://sonntag-immobilien.lu/userfiles/files/pixubasakezubejewododan.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/b84pt9nn8qoc1i65vvt126en9l/88319572915.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/m08pqsclkmfhahkb8lfkl76vha/61112328104.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/452e4bd6eac47c43a151e4fe1e26c8c9/pujabapekoxepujalarojid.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p4pkaucscnbbj3eui1745ov8v6/78627936063.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08918ad8df---14528068774.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/muradedezabe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/800547d55accc89e6e147a546017dfc1/74589475787.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/gawamivosevagakefin.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/lt65c6jgp671iaafugg0cogco8/62355705165.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/33963669538.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac046cc3417---tadigugakilu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608372b495b38---lewokipowi.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/domururovinumokedizorojav.pdfIn PDF document text
    • https://afayl.com/userfiles/file/47078034881.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/gurolij.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/159476b6757a59020b6d8846b7289fd3/39664154163.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78b26078---vatajurifuko.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c150a6c7906---92554301414.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_off000144e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFD 10460 bytes
SHA-256: d260b467537311fd5bd22ee1f3b6ddb624d226739b85ee3bfcb3633c799d8698
font_02_sfnt_off000174be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BE 18288 bytes
SHA-256: fafe5f1dca2a2936b2e5f1263704cd17a61ef0339a9dade59ba6cef28a0a1160

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