Malicious PDF — malware analysis report

Static analysis result for SHA-256 d262b397de7bb432…

MALICIOUS

PDF

146.4 KB Created: 2021-07-07 02:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7f2d3b54aeec78f78119bb79b75cb1e9 SHA-1: 3edbc04bf5af26e8e6ef7d92dd4d7ae2bc00e667 SHA-256: d262b397de7bb432783c006521cf5599650557c5f6e65f31b7667e4d5b942bc5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to compromised websites, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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 http://loaamtran.vn/files/usersfiles/files/36018063095.pdf In PDF document text
    • http://www.abcklima.hu//data/editorfile/rowukujixofijolawarumos.pdfIn PDF document text
    • http://rld-carbon.ru/file/ledamizonufabexajov.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/74995017941.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/68029656112.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c961f2ed64b---72335059098.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/p87avs11jl5aq2dho4hk80e7bstdnrcr/livezarorotejomiliga.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/39sci6bnp83ml963d1udbrbvqo/todojilubebuzuwoxe.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088db7bac639---35182489567.pdfIn PDF document text
    • https://electroagro.es/pub/files/xapedamajuvufajexevum.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/miwune.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/mekavosiziluduba.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f6b16550212cac2d4dfad9365112560b/15140741235.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ijpus918pb011j7gr305rk5ma7/38435701130.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/8692794990.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/ratala.pdfIn PDF document text
    • https://airshow-bg.com/file/biwuvekawi.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/ruxizulenobetepototusezi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160886d5a2a976---87743892928.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/xiponafororokoxa.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/4056727278.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b4bdaa7d---meliranar.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ofaiss92q3krfvdg7sv4bad7h7/movitikek.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db018593da2---49160381439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=one+punch+man+all+episode+tagalogPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDC 43024 bytes
SHA-256: 44f9ca6a4c76786a3a0ca3c7913c37e44a0886426eb1294db738d26aa5d74148
font_01_sfnt_off0001d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7D2 18500 bytes
SHA-256: c6d39c4d2c24fec34594de639823b5bee2aa4b07ea9adabacd338d316bbbad48
font_02_sfnt_off000208c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208C0 10988 bytes
SHA-256: 15b04afec2507c08baffc6b0517d917b3371b96ba0da5cc2cc895aa8217f205d
font_03_sfnt_off000221dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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