Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e3e4197d9b8b94…

MALICIOUS

PDF

77.2 KB Created: 2021-07-16 00:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85826e134fa6908b83ff04c94a1ff16d SHA-1: e3cfd3a4719657f0d72164d4a067382f2e928a84 SHA-256: 62e3e4197d9b8b94ed412320cb4e191d7997e46c467f2dba636ba57c373d3cbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the URLs and the detection names suggest potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=boy+scout+camp+physical+forms PDF link annotation
    • https://mabuksusu.com/contents//files/wipubano.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/24049faad44a79730cb941981d8fce08/34304830615.pdfIn PDF document text
    • https://rintrans.com/files/17635228568.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210521214336112.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/kagururekuxiwijosutibeb.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/lomojafemavukif.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7c9b628c3f8df9064f4db52ca07f6c43/94601799484.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/dezikami.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/42690429683.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d79ce43e999---60486495764.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lobagobibomokawupukusomu.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/65799529391.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c24329ce---84453619613.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc6544070---tisowulimu.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/73413852415.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b87ca2b9d---nedogu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/safefimegirowexej.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/adc986cc71fae32b1cdd666794f1e3fa/62012892382.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9bf910210f36ddc79561a52dfca5375e/taxaf.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d4128253180feaa01895de6fc9a2d6c/34072113165.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vumupaxawusa.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/81786870254.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_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 16632 bytes
SHA-256: 4b8cf1d1200740569754005e8456907e88f98d1bd84a37bb3a44ffe4c63ac28a
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 10776 bytes
SHA-256: 701b68b5c3971ad79b5715be12755b3d8cf4e73340d5fd28181aa77f0440b598

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