Malicious PDF — malware analysis report

Static analysis result for SHA-256 d304135f0f8a0e8c…

MALICIOUS

PDF

110.2 KB Created: 2021-07-14 05:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d48439579316560d8e59a02fc17bd7f SHA-1: d7437ad8b26b4b84f6aa553c7f622ecc87b18730 SHA-256: d304135f0f8a0e8c30771de2d7021b3b0c78b5fcc849c5722648db12a329562c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=how+to+cite+an+internet+article+with+no+author PDF link annotation
    • http://aldo-ins.com/userfiles/file/69457502161.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3ff0a20262194bfe58e1f8c1adf61f9b/wolokodirojigatexi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/15690044955.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/l1bf8es2vdgadlgntsgcf09oa7/geluka.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd5eeb3ef---zupixodipedonugonajut.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/109201268c47443a319c73a41ad3e166/fodefobavepazuli.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975e7c653ba---fejarux.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ebs1uscb502l94di0b98npffk1/berivezimubadegejafofozel.pdfIn PDF document text
    • https://banghenails.com/upload/file/kagekesavebaz.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c735728b16102bc4a01d04a36f3e82cd/48743959792.pdfIn PDF document text
    • http://jar-ted.pl/file/sizobasub.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4hk7a9hdf8uiigrtfqflcvpouo/desijufifanimularule.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/91732157985.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3138c8282---25408732125.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/29304181108.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iaa12tpjsc5bjm5b4lpfs62j44/tiverir.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dl3hfei21obj7vp90s9l1khi10/reweriwonekewotosobexop.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4accd068---79011415450.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/voxebofenuk.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f49ec5e52---69462060230.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be9099a8f2b---tukekesiwalipejusi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/79932909340.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ba683f0d6ad---tavagap.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160851e952728f---33500206583.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_off00014cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBC 17924 bytes
SHA-256: d013c656947c395a9839f8976f32fde8e3121659e33045ae11f9faa993bb483e
font_01_sfnt_off00017bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000193ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193EE 10336 bytes
SHA-256: fee4d76bceb1db59f23c5a275261cc244319b8aaba96bde435bcd998593fe4c5

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