Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f39c3985172d75…

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 03:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cead42339ddb1a6249fe7d685b4bbf33 SHA-1: f6304e30d05d1b6e3c0ff24db3de48b5dd961c65 SHA-256: d2f39c3985172d75d5eb9dc21de988e10d6454e18afbcdbc570c74ac001642c7
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple heuristic firings indicating malicious intent, including links to algorithmically-generated URLs and compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used as a lure to download further payloads or conduct phishing. The presence of embedded JS points to T1059.007, and the overall malicious nature suggests exploitation techniques like T1203.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=manual+canning+machine+canada PDF link annotation
    • http://woodlander.sk/grafika/file/vegojujelojur.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/9823419797.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/53697532970.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/92630098540.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/vigone.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/rokevigudidujapamu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rewerukedikevibifama.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/77901905454.pdfIn PDF document text
    • http://tornado69.com/clients/40643/File/42566119654.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/zesolomupi.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/44309209094.pdfIn PDF document text
    • http://solac.nl/app/webroot/files/userfiles/files/sovixutezuxesolaribokeb.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/65769042733.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/fikitomabutukemo.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/13628822348.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2ceaeb95247ad77f4bbe6afdb2c40565/19589778710.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160913f5a44e3c---fanikigomugenos.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/wavivulekeje.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/16080546743.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed493a62a---81336299161.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/xuxagodel.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/6oasm69scou0vv86jv3stf16ll/15265116264.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a95a729f5---83628375560.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/9539375227.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/54941481289.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_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 10424 bytes
SHA-256: fb75859af2c7b7ab49be98afbdf8a5c3f6e4dca24c1cea955960b6e7ec8be89b
font_02_sfnt_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 19332 bytes
SHA-256: 5df76f3927c3b96de9dd2d52a0a73c5517f72cf6245666688255ec691fd78a5f

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