Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd36c4059b011b3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 05:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f33e3354be85361efba53fd3dbc8faa SHA-1: 2e6e4d5cb126062e8f28773cf1be049ed34e5b99 SHA-256: bdd36c4059b011b3b63ae6d72d8000dcbcb1265b024f807c0a8caa5fddbedd5c
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294fd1b2068---pakiluzetelolin.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f24f00627---16572798062.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/54676039363.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/dugijojopasezumupanom.pdfIn PDF document text
    • http://prosquash.by/data/28663256014.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/11763635639.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/39450261441.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c16dcacaa---81601979653.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ca88a049---nemejewaxikutexasigowun.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bab7125ba2cb4461fae0746040d5fdb7/48346422379.pdfIn PDF document text
    • http://nenorm.com/files/files/kezedonorusopafomewidejaf.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e2b12d8a---45741096315.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/turunaxonizorejazopejof.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a23b5f462---gorabofu.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/54344321219.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/19450807281.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160aecbc8031d3---31485962395.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/toselewozipuwulovanebowub.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/tamev.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/kutedodixa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b8c88f7a---voduxujuzofogek.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a7214ca9144fcecb0cef2896a559c4c/sakijowebok.pdfIn PDF document text
    • http://i-dron.cz/data/file/jerupemirujebomotida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lto+exam+tagalog+with+answer+pdfPDF 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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 18300 bytes
SHA-256: 78ea18d7b200b9e8f414fd4e0da168bd2321600a8ec5d30a40f63a29ef14ed43
font_01_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B21 11092 bytes
SHA-256: 7cb2886d3fd2f916a852ef4d741b5cde7ddb869f80f2b3ecde172c1479f52229