Malicious PDF — malware analysis report

Static analysis result for SHA-256 053cf7d58a7ec480…

MALICIOUS

PDF

90.8 KB Created: 2021-09-04 01:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3beae28470b1297c8b52b66655e673c1 SHA-1: 6ef0e3f5ccccc0e1a459b9262e09327d70f75892 SHA-256: 053cf7d58a7ec4804e07e47e06bbe699133bdb46680345fffc05226e948839da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely part of a redirection chain to a final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ns7vnkl3lp3l0d5480a19dbm80/suduka.pdf In PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/nibaritufutosiwijatelum.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/fekobapesidaxerogugo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/jagivudigedosubafefogafu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/3cd5e97fbb346d1219a765455cfa5689/21622261638.pdfIn PDF document text
    • http://tianfonmm.com/d/files/revabulexe.pdfIn PDF document text
    • http://fabtur.ru/upload/files/6279198421.pdfIn PDF document text
    • https://alutat.com/data/file/revofofewisovudagu.pdfIn PDF document text
    • http://zzweien.com/d/files/64168398092.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210720013710_ue3bij.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/dafojonarunobifov.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/zevixiriwidap.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/sopajosajekikamodisovezis.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9039266341---91509212815.pdfIn PDF document text
    • https://ranagro.com/files/60384301769.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3a556ba0bd6b9700f72d49006bf2fa97/34092348046.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/369c261c80f38e4361272cb30d07680a/vadejimawibarupoxa.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/87778cc6587af86e9fcabd5652fbeb51/61148458474.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/lurufevikagowatiweguza.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160870e50431c1---91741573622.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/kezivak.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/zivimarabute.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/zibejogolerebukovuba.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1spuoqn0rc5jv3mi7q1d5agoap/3766858780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bosch+gas+range+oven+manualPDF 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_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 18432 bytes
SHA-256: 1c4f9b00b52ff7aa141a124656ccd973eb87c1b81f5995a930224f7c43eb5ccb
font_01_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14556 10708 bytes
SHA-256: 0733eb52d8b51ea89a41ca8d00c66c3f291dcfd81db7fae06b47febafb810ca3

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