Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0a357626ea1e3e…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 20:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8b6e6588150fd0fd7a307df6354e7abc SHA-1: 12384affc11e258b76b8de2336ee05a665a29a0e SHA-256: fd0a357626ea1e3e484c9389be61ce8f92db81b6fe5d8f1051e4c128b77e9cce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including malformed streams and a link farm pointing to compromised websites and disposable hosting. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+two+major+divisions+of+the+nervous+system+are+the+central+and+the PDF link annotation
    • http://fygl.net/uploads/file/212250082516.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/dopasemisuvojemakoba.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/lozomabituguzewaboka.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/81224421597.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i72emk6sok8e9nft3tr6dr5o18/jafujoxagelipaxuxagine.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/51264401992.pdfIn PDF document text
    • https://combrooncom.com/contents//files/78830533961.pdfIn PDF document text
    • https://nevisnews.com/userfiles/sirerotamaremubudubazok.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/134c7ac8c4e3520a1e4179deaf75f2b0/16285469400.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef8908186---36865618036.pdfIn PDF document text
    • http://tai-group.com/upload/files/tixitufemozijimoka.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/rasiwikegudusowilu.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/judutalajuxifomixeb.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/zevolafoxokizurotozafe.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d242a8ba8179c38f397d3d17cf7c60b2/37024706808.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/fujakulerikit.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c2bc7270---60427566447.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/basaridakabebizarerav.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/a59f71bab956fbf0ee5e2e593ed142df/90543103572.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b09fe82843786fb2cef6dac44926efe2/jikidu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wunenilumorulonu.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/55701567620.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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 11200 bytes
SHA-256: 0eecbb6875b00ecfb3a78b43d8af81a5380fcfb3fc686aff71d90fcc694ec08a
font_02_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 16628 bytes
SHA-256: 5e2a3c62b479d84d54ec8fb8ea704bcd14f5f25bd67a7decdb1d62e7346e887f

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