Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bd9d67fce023c6…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 18:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b61c0949a3248270f460cc372e304057 SHA-1: 26bd338e71f0d6fb5428de62510379cef1639d7b SHA-256: 71bd9d67fce023c62374517520e9f02193a433db6b70cd5f9647ca28021330a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it contains links to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://kasihpaham.com/contents/files/71314804326.pdf In PDF document text
    • http://agataklimowska.pl/userfiles/file/tatol.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7de7ba6ee03f584d80d6ed0a5125f66d/pegirowuduxetibapudu.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/68567432109.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb21e7eb17---76296408816.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c77afb4d288a2493955b12189c74141d/23130214322.pdfIn PDF document text
    • http://yuha.be/_files/file/tigozawibetizod.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5786b08fe---50448310229.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/dc9c75ac3155267ab6c74e30e7780e68/nofidemij.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/falabalawa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c85gdqpfpq0l3ofpl58qci0mfh/17348323906.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/xawemotimepafaliwasetin.pdfIn PDF document text
    • http://birdwatching.sk/media/file/47463156572.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b06f60519---42588722823.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/lopubiserometesu.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/6399011741.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca5630df57---lavedokomo.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/26991522834.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/076b73c497070aed717ca0e5cae0c1d4/bekisirozezubalebegomosam.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/42221547425.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/77821519047.pdfIn PDF document text
    • https://badrivishal.com/media/71127648415.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/5866871366.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/69c4cfcb8fca2a41fb64fd1c8444868c/82549087677.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fatapanipuvoxori.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k1581f9cmghbt3u8bv7un3v3n4/gumizometuvovepewaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bacteriophage+lytic+cycle+pdfPDF 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_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 10792 bytes
SHA-256: 0310d504889cbca9e485a250a196eac26cecce291b5840a11264b41401857e8e
font_01_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 16604 bytes
SHA-256: 58aefdf990eb5397fc7f67c44013fdfcf3e099bcc7b20d1fbab82a832e83b3a1
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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