Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1449a1c8177357a…

MALICIOUS

PDF

121.3 KB Created: 2021-07-30 17:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4112396bc3c0f0e6bf7a38a30ef1fd4f SHA-1: 746ce91ecca4fbfc2d7204650b8ac6fc67320b53 SHA-256: c1449a1c8177357a6aeea7d8122f8eddf9a6aac8e1aa3486f54e36df929948f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://feldbach-tourismus.at/files/32021674029.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/nileiur1hnjc9fel1a0uv6l4j1/17029124936.pdfIn PDF document text
    • https://loctra.net/userfiles/file/99243028038.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/nedasitedufuvudefosexamum.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08432e58f---likirikokumivezulijaxid.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/60286550876.pdfIn PDF document text
    • https://peterdegendt.be/file/natizarobefuvoxekapokum.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xagerefafurakirun.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/12c8787666a7ad68ae9d92bd2a485122/fexovifitik.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160fad17ff39d5---kokazojif.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/77300145775.pdfIn PDF document text
    • https://network-italia.com/file/6288077219.pdfIn PDF document text
    • http://scriptonica.ru/files/files/70736306552.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4907e67508542d6fa809a647ac3da285/38943443881.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b108ce04fecfe50539d3241b334a854/61351146086.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/lukamudebesap.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fe3a8e680c32c09005c7c7c4dcd18606/7420023839.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/87367010725.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/87623567613.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867fe5e390---bifidazusaremijesik.pdfIn PDF document text
    • http://riph.pl/userfiles/file/govesekizokenedemazagepa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbea71fbee---rojakuduxe.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/dajivelapesazoniren.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ea35eca1---barorofidesosurajadud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=filmywap+south+2018+hollywood+movies+in+hindi+dubbed+newPDF 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_off000171a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A0 11544 bytes
SHA-256: 3fdb597695da463f9bf5259d628fd8b7c7c3bf8e72eeabb8a40d3f3c830bcbca
font_01_sfnt_off00018caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CAF 18672 bytes
SHA-256: 22a0daf2a1bd88d04367febefbf26cba5b411a033f4a4b178137c902f88e0d17
font_02_sfnt_off0001be49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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