Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd3533df4955331…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 14:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd854b5b7f3a6d897e635d9baf7e42fe SHA-1: 206d16fae36eec93ed3e2be0b63bb880dbea69b7 SHA-256: 5dd3533df4955331bdd16001ce835e54fa798f22f4dc24bf1d2cd79f61c758cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF format itself can facilitate the execution of embedded JavaScript, which is often used to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=remove+deleted+files+android PDF link annotation
    • http://mertcelikkapi.com/userfiles/file/77005250733.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/rakukap.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/dalad.pdfIn PDF document text
    • https://zakazspbwatches.ru/upload/files/13285443782.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/vawavi.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pavij.pdfIn PDF document text
    • http://recrute.fr/files/files/32834338596.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/3569722315.pdfIn PDF document text
    • http://philboyd.com/10827136660.pdfIn PDF document text
    • https://phunhai.net/upload/files/29516952832.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/26540411733.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/kudekanef.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a92168fb---80757257071.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6ebf8c5deac8176b93dc46099039d15/90600621329.pdfIn PDF document text
    • https://orangerun.re/photo/files/38307525739.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361e14cf074---51877723917.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/79670396387.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/benapatikanowuwekafinoj.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/51977942568.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/nipanakekogup.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/garovofugavibu.pdfIn PDF document text
    • http://altus.pl/userfiles/file/wawopadexunijatufobafa.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/51991866106.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/dinulepomefebonurovaz.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/kazoxuvezazopewegajax.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_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 10628 bytes
SHA-256: b939db7f8ceb6b464c2ca6e1cbcb394645e39da54c955eb7180b3ccd07533d7c
font_02_sfnt_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 18188 bytes
SHA-256: dc84444d4aba5983a8b97ca9fa9072765cac72abfaab592718026fc5da3a2039

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