Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d3d8805d1fb49b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-27 23:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39ef61c709ec26170079558ab46a18ac SHA-1: 442ad16aaa1cab13e21ae3197422ab4ebc90d1be SHA-256: b7d3d8805d1fb49b6aa5e40e9dbd11bac291cfe39f1b3aaee62a09a63be44a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of numerous URLs, many hosted on WordPress sites utilizing form plugins, suggests an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160870eeb1c6b4---80333623716.pdf In PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/44288010493.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e1f8cbfb---rinefugipakilijoro.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/47773039194.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/44004990328.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5545f57a07e91f62df98d6fe8801bfa6/90450359505.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50882299b8---58985760040.pdfIn PDF document text
    • http://teplospectr.ru/images/files/72982886607.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c522b268ef1---lafibuwibefitopas.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/jolotadopunebonelavafi.pdfIn PDF document text
    • http://maihome.hu/admin1/file/51404752547.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/44236005933.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210714131548.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/bawuroze.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0a9711076---23751726794.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nanezetofamijepininotizag.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/68be9cf95c3f0acaf5162652f2a65e3b/putaxixo.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/11585745493.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160941ed860dd8---gosalatokiwudexalab.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee570d21a---sisilatidobabegi.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fegutab.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d879562cfbef6851fb56d7e180e25f9d/toderadujerewowoxigoli.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/wujezitarolivote.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uq6smn9lpe233db8bc0ujl5t1i/pexutadozikifuw.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afffe05d7---debefipuxubun.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee6dec1d9---34275786851.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/21260059526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=angielski+dla+pocz%C4%85tkuj%C4%85cych+testy+pdfPDF 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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 17840 bytes
SHA-256: 447a13d9d09a3fe579559f21a56f3b3cec584a5b93597ba3429f2601484fa4ca
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 11512 bytes
SHA-256: 50c8c8a3cc0b4f8fb905f723f06623b911e7af18a734ede8b8db39279d378bc8
font_02_sfnt_off00012f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1