Malicious PDF — malware analysis report

Static analysis result for SHA-256 757d15e49476ab25…

MALICIOUS

PDF

84.1 KB Created: 2021-07-17 03:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0124547b870e130183720ba660d0e06f SHA-1: 29aeaed06a81c46349a6ccd7106375fc53bf8d1b SHA-256: 757d15e49476ab25f9e2859d3be29e1e2ab34c4413e1ccf9dd504ba0c7023487
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and IP address literals further supports this. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gruppocinofilomarsalese.com/userfiles/files/4021701586.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd36b6d67---fiburugore.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c0125299---39972737849.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/bubusaxujazugim.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qh3epqolrru800kgjn2c9j2381/walovumitotovokip.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/lewojemerumijifujapu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/86736f4deeec73d2fc3676c979bd48e0/79235714089.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160764a1467166---direguw.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0ba0b7dd---70848723548.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848be233445---depiramapipaludexexerav.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/33237339032.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e74b08ac421---gezabibemamifisakip.pdfPDF link annotation
    • http://batiment-tunisie.com/userfiles/file/59309262629.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/28f5963b313b1b4402617d20bd46b324/86725979534.pdfIn PDF document text
    • http://vejwun.cz/images/jifuf.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/3479858804.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cbacf04d---4172481589.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f181737b7---21626288945.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c4f11986d---suruxivukododo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd093642e9---lepes.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/70189700704.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/11247519348.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/95427822052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cold+sore+on+nostrilPDF 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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 16600 bytes
SHA-256: a44d96856e407703b9e4dae65068e3c4aa75da62424ff65aa281788260b78084
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 10112 bytes
SHA-256: 60c7ee60ace311acb7a31839cfcd6154e6a21ef7b89becc76133b5be696d9e0d