Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dc5420c962c858…

MALICIOUS

PDF

86.6 KB Created: 2021-09-06 05:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dec8d17c9ceae1ba1937349ae4220414 SHA-1: 0ee4db576d185ca599665098655a59cb1ff81979 SHA-256: a0dc5420c962c85874d7dc9eb2d88ab11d9040b0288ae4f6b37f03cb91ee9beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs strongly indicate its purpose is to facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=amperimetro+e+voltimetro+exercicios+resolvidos+pdf PDF link annotation
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea761c612---fuzitumu.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/fazupatonabeja.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/41983510071.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/fatutemovajisulejofasut.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/nugijibowusonujef.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71a7b6b04b---28372492999.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/bigemikajimesigejuvunir.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eff44465e---rapevajekupajapoveze.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b3c4769e---dobapewurebofixekudize.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/lalodujezuxobetob.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2786524a---23712464957.pdfIn PDF document text
    • http://enricobarraco.com/files/36891523631.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/tajiwi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2cf07d065---jedepibesarakusinipuku.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/83814817499.pdfIn PDF document text
    • http://lj-group.cn/upload/files/51791375150.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608434e9ab14c---87084068528.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/83150845376.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/21678371102.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/69hrmuhd7pduvnabna1oojrd45/deninumalisegirubev.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/larulexubasosawelefavaji.pdfIn PDF document text
    • http://pedraferro.com/files/files/gemuxuximewiketadozegitok.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da8062b814---16003159288.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160829b885d642---wabakazakikaxaron.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b021bb05ba---86335061207.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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 10664 bytes
SHA-256: 7c077cbdde90685ce7df234731c7da52e7a233e4f884ca338715b8a425b68963
font_01_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 20916 bytes
SHA-256: c5f82c84bce25aa32423c4c5c0fe2ec8d9863b7f6c8da21ab12ce056c5b62c45
font_02_sfnt_off00013423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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