Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c865e7e0ee2711…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 01:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3016c4aeb45e22c1ccb2b27ea1a9204e SHA-1: d3740fb65b9ccfaf2283c824822feef02ff3fb8f SHA-256: 30c865e7e0ee271117c4cf3a650b7c3e435c281a72ff7acb2f9d912290018cb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://zartmobilia.com/userfiles/file/20210527030703.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7924d3c8d---82513796068.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/31491027482.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/30113140543.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/37204638d50ac83f758bbdc85a5656ed/22580747894.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/bazote.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/gubodituvojuzamamaremakad.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/seposi.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/97427059502.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/rufaboromulupir.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/fipozawekusemikak.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3ec2aef4---2863821287.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e48a5d77f0127fef8fd72da13cb17948/bobevanufumozifokadiwoxal.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f3b08a69---girudinabuvigi.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/51657195970.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/amlfqu3fe1hps0atr6qpisf7ui/61756487361.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/biradakiwovuzewutid.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/49757409800.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/10269354886.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f96ec5317---nizasazavujilijomerivo.pdfIn PDF document text
    • https://mytopics.it/uploads/file/numakod.pdfIn PDF document text
    • http://domplus.su/userfiles/files/25088305492.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/mozidenilopabinug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=photosynthesis+and+cellular+respiration+are+a+cycle+in+nature+worksheetPDF 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_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 17308 bytes
SHA-256: 1cd541280416c9a158cfd88e9068822d01e95db135653e80e0460ad72813af24
font_01_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 11004 bytes
SHA-256: cc0f78e4557df717d2d32ac2559eef3c3fdeaad02ad2bd4f2775f979f673e0c0
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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