Malicious PDF — malware analysis report

Static analysis result for SHA-256 38167073610e738d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 23:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0c766fcf594218aae11c830997c64e87 SHA-1: 4cdc04140ed9ec00134533783c556b818c4f37c4 SHA-256: 38167073610e738d016642a1a4799aaf42a2c3b3ce4552bc115532fd73e49d05
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a PDF link to a compromised WordPress upload and a link farm on disposable hosting. The presence of a visual download button further supports a phishing or social engineering attack. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The primary attack vector appears to be directing users to download further malicious content from compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=engineering+physics+notes+pdf+download PDF link annotation
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161183b4bbb905---mafibenekonavel.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a11948dd4---69578797584.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd4e5b5c4f---60902374965.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/falemexesibesatapiwa.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/femakiwasubal.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/garebif.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/xobanajotetas.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/fevafisenikezovi.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/bajirukafofafanuro.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/19448545717.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/iumg7li3cg7mt8q5uqss8klth3/1815463888.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202156349507920.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/23800996379.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140ff35db9---ziluxokiselegirazubo.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/65310742707.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/28855817474.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gokizivarisuzigajimoguw.pdfIn PDF document text
    • https://2acontractor.it/images/file/fisusisamavumaxed.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa051232510---28410877124.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/25661762157.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6mkikpj4scjpti8sijsj497fs1/paforajonotufozure.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 17968 bytes
SHA-256: 0093f420ae7e2d26c37473ff594d996df7ab75de924448b2e38d2d84deaaaab9
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 11084 bytes
SHA-256: dacf3b7e05e2a8e70aa920055d8901ab65dc53a0839e7c181ac2c10838b782c1

Open this report in the interactive analyzer, or submit your own file for analysis.