Malicious PDF — malware analysis report

Static analysis result for SHA-256 337c7a0945ee9950…

MALICIOUS

PDF

92.3 KB Created: 2021-07-25 04:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1d5175b1c803bd14a5c780a09aca15a SHA-1: 23afb44abf438a40add5c7f2e04ddc96ccdeb670 SHA-256: 337c7a0945ee9950aea3e19bd38fcf3ecaa2102f5879fef8ac1cafc04e352df8
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a machine learning classifier and ClamAV, with the latter detecting it as Pdf.Phishing.Trojan. Heuristics indicate the PDF contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8fabd39066126c7c98392421bf9a71e9/sepisofutega.pdf In PDF document text
    • http://i-dron.cz/data/file/1796597357.pdfIn PDF document text
    • http://gptools.net/userfiles/file/11991326384.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608180ab3ecb9---81254700768.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/ritujuxaxagagulitowif.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/19418979691.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/goduxofulosuzojewera.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42c6bc71d---68012129035.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/bezimajixologezazaziban.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e9e15a14818c7e0c2ad6485bd4b21318/xurorivad.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3814103cf9---12616004688.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6649dee316---46650939267.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/banetifonato.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a5692365---kepol.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/aa654f5649830c159adf370db62f0e28/gobukoganabesutomafa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e402ad44a---41348906296.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/67578660997.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/32476186623.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/kitokegimagajagurifix.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607770ad15bc9---33421797480.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/xiwiporosij.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/24815130875.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/vozebuk.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae749901590---64002653368.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609269629b660---mugubodezub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+can+i+see+hidden+information+on+facebook+marketplacePDF 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_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16968 bytes
SHA-256: d96dc63126f5deb67a9f3dd4dde392fb94fa15f2d4efc5f4032a962a160dafad
font_01_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 11192 bytes
SHA-256: 7d29d5d6d33c12b9c211ab092c4a375ca4863274f168d7ef9bfed0ab52f58db8
font_02_sfnt_off000149d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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