Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc0b3b4ed68b5f3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 18:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a4cb493f17562588425dc0001c35471 SHA-1: 85b22827b98da3893dc80f34cc7786f4d5387588 SHA-256: 9dc0b3b4ed68b5f3c1583578a94a82efc8dd778e33969431ea616959ec1dbc64
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits multiple high-severity heuristics related to malicious URL links. The document body is heavily obfuscated, but the presence of numerous external links, including those pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristics indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=download+battle+warship+naval+blitz+mod+apk PDF link annotation
    • https://anfauglir.com/images/file/woworogiluzodeturonaworig.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/dasejudulanexujelabu.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/24128436048.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210910231219.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fowujefepuje.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/76804413080.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/vavisowomijigukovola.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c12266ae0ce7d7d9e545f4c6456a22fb/rujubogobenovawolag.pdfIn PDF document text
    • http://zamgph.com/uploads/file/032201309021.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/97392994760.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/54717317583.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/godovutuvetuwak.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/xepumuvujebogeguwikesob.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/vomijonokizimilulekudi.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/55377491387.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/gilesalonawolevirigi.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/5322525591.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/lakeviwigizijetizovasulo.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/nugutaromufiwireg.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154a1675b3---46139612721.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/59cafcde44ebaacb04665bbd75fc2000/nemukinugiposonen.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/37023621972.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/2761048943.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/10055148204.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/nojejigovezobimukugi.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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 11100 bytes
SHA-256: b221acf78156fba96f8ffcf35613d8f1c77b38b3c0fc4f95881d0aac9eacab15
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 17632 bytes
SHA-256: 6fea35783dabd9cdfd384fdfe41ae8195b5a8eb1555baab6683748e1773be3e4
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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