Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9f4d6897df91aa…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 07:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b738f95aecefbf4b8593d2f51459cc3 SHA-1: f960fa762091bae5076ca7fc9c77a35ab3b45402 SHA-256: bc9f4d6897df91aa9f46e70ac28d8235493db23d278d4c638833827f858ced4f
212 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, several of which point to compromised WordPress sites or algorithmically generated URLs, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of urgency lures in the document body further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 9

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://crysiq.ru/uplcv?utm_term=toonme+app+pro PDF link annotation
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1064ef3c---38667816420.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/27630074747.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210911091800_1483677916.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/divuzisodoromuxojom.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/pijusumiluxezusajoze.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/33680581097.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/lazupapinimawikadur.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131da206fe27---pinowe.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/dufuj.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/34493136045.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/bixofemoxonatatisizer.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/71017638293.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d9b5d73c5ecf2379b479b69669fd5a88/48759777572.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/56041468531.pdfIn PDF document text
    • http://bienbao.net/uploads/files/toxojefenopafuseje.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/6785489419.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/38281230898.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/butesonuzinokoza.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/norufu.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/16135198222.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/rolinu.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/29476482828.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a5eb7c65b133bd78d4df6efbea0287ee/76506191906.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_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 9972 bytes
SHA-256: 7cc86d6b9e13ee7fca4e4de82291c7a7287a6372ef07456330b016a8e1979ac5
font_02_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16428 bytes
SHA-256: 5399885caadd6fa156e41232c0dc6c90eae19341a391ce429b82e7be930a5611

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